May Celebrations

ALS (Amyotrophic Lateral Sclerosis or Lou Gehrig's Disease) Awareness Month
APS (Antiphospholipid Antibody Syndrome) Awareness Month
American Wetlands Month
Arthritis Awareness Month
Asian American and Pacific Islander Heritage Month
Awareness of Medical Orphans Month
Bicycle Safety Month
Borderline Personality Disorder Month
Brain Tumor Awareness Month
Carrots and Cauliflower Month
Celiac Awareness Month
Clean Air Month
Community Living Month (Ontario, Canada)
Creative Beginnings Month
Date Your Mate Month
EcoDriving Month
Family Wellness Month
Fibromyalgia Education and Awareness Month
Freedom Shrine Month
Gardening for Wildlife Month
Get Caught Reading Month
Gifts From The Garden Month
Go Fetch! Food Drive for Homeless Animals Month
Good Car-Keeping Month, Natl
Grapefruit and Kiwi Month
Haitian Heritage Month
Heal the Children Month
Healthy Vision Month
High Blood Pressure Education Mont
Huntington's Disease Awareness Month
Internal Audit Awareness Month, Intl
International Audit Month
International Business Image Improvement Month
International Civility Awareness Month
International Multiple Sclerosis Month
International Victorious Woman Month
Jewish-American Heritage Month
Latino Books Month
(World) Lyme Disease Awareness Month
Melanoma and Skin Cancer Detection and Prevention Month
National Allergy and Asthma Awareness Month
National Arthritis Month
National Barbecue Month
National Better Hearing and Speach Month
National Bike Month
National Blood Pressure Month
National Cancer Research Month
National Correct Posture Month
National Egg Month
National Electric Safety Month
National Family Month (5/12 to 6/16)
National Foster Care Month
National Good Car Keeping Month
National Hamburger Month
National Hepatitis Awareness Month
National Inventors Month
National Lupus Awareness Month
National Meditation Month
National Mediterranean Diet Month
National Mental Health Month
National Military Appreciation Month
National Motorcycle Safety Month
National Moving Month
National Neurofibromatosis (NF) Awareness Month
National Older Americans Month
National Osteoporosis Awareness and Prevention Month
National Photo Month
National Photograph Month
National Physical Fitness and Sports Month
National Physiotherapy Month
National Prepare To Buy a Home Month
National Preservation Month
National Recommitment Month
National Salad Month
National Salsa (Food) Month
National Smile Month
National Stroke Awareness Month
National Sweet Vidalia Onions Month
National Teen Self-Esteem Month
National Tuberous Sclerosis Month
National Vinegar Month
National Week of The Ocean Festival Sea-son Thursday before the Second Saturday in March through Second Saturday in June
National Youth Traffic Safety Month
Personal History Month
Potatoes and Limes Month
Prader-Willi Syndrome Awareness Month
Preeclampsia Awareness Month
Prepare Tomorrow's Parents Month (5/12-6/16)
REACT Month
Revise Your Work Schedule Month
Skin Cancer Awareness Month
Strike Out Strokes Month
Sweet Vidalia Month, Natl
Tay-Sachs and Canavan Diseases Awareness Month
Teen CEO Month
Teen Self Esteem Month
Tennis Month
Tourette Syndrome Awareness Month (5/15 - 6/15)
Toxic Encephalopathy and Chemical Injury Awareness Month
Ultra-violet Awareness Month
Women's Health Care Month
Young Achiever Month
Young Achievers of Tomorrow Month

Weekly Celebrations

Maifest, first week of May including the first weekend (May Day and Labour Day festivals)
Cinco de Mayo Week, first week of May. Includes the closest weekend to Cinco De Mayo when most of the festivals occur.
North American Occupational Safety and Health Week, First Week in May
National Safe Kids Week, First Week in May
National Travel and Tourism Week, First Week in May
National Charter Schools Week, First Week in May
Children's Book Week, First Week in May
Brain Tumor Action Week, First Week in May
Child Nutrition Employee Appreciation Week, First Week in May
National Women's Health Week, First Week in May
Substitute Teacher Appreciation Week, First Week in May
National Transportation Week, First Week in May
Choose Privacy Week, First Week of May
National Forest Week (Nova Scotia, Canada) * CLICK HERE

Be Kind To Animals Week, First Full Week in May
Children's Mental Health Week, First Full Week in May
Drinking Water Week, First Full Week in May
Flexible Work Arrangement Week, First Full Week in May
Goodwill Industries Week, First Full Week in May
Kids Win Week, First Full Week in May
National Alcohol & Drug Related Birth Defects Awareness Week, First Full Week in May
National Anxiety & Depression Awareness Week, First Full Week in May
National Family Week, First Full Week in May
National Hug Holiday Week, First Full Week in May
National Pet Week, First Full Week in May
National Raisin Week, First Full Week in May
North American Occupational Safety & Health Week, First Full Week in May
PTA Teacher Appreciation Week, First Full Week in May
Public Service Recognition Week, First Full Week in May (publicservicerecognitionweek.org)
Update Your References Week, First Full Week in May
National Correctional Officer's Week, First Full week in May
NAOSH Week, First Full week in May
National Hospital Week Usually, First Full Week of May
Dating and Life Coach Recognition Week, First Full Week in May (Also see September) 

Salvation Army Week, May 8th Through 15th 
National Stuttering Awareness Week, Second Week in May
National Hospital And Healthcare Week, Second Week in May
National Running and Fitness Week, Second Week in May
National Nursing Home Week, Second Week in May or Starts Mother's Day to Saturday 

Public Service Recognition Week, Full Week of May 15th
National Police Week, Full Week of May 15th 

National Women's Health Week, 7 Days beginning with Mother's Day 

Reading Is Fun Week, Second Full Week in May
Universal Family Week, Second Full Week in May
Food Allergy Awareness Week, Second Full Week in May
National Return To Work Week, Second Full Week in May
Salute to Moms 35+ Week, Second Full Week in May
Work At Home Moms Week, Second Full Week of May
National Stuttering Awareness Week, Second Full Week of May 

Arbour Week  (Prince Edward Island, Canada), Third Week in May * CLICK HERE
National Emergency Medical Services (EMS) Week, Third Week in May 

National Dog Bite Prevention Week, Third Full Week in May
National Educational Bosses' Week, Third Full Week of May
National New Friends, Old Friends Week, Third Full Week in May
National Bike to Work Week, Third Full Week in May
National Bike Week (USA), Third Full Week in May
National Medical Transcription Week, Third Full Week in May
National Backyard Games Week, Third Full Week in May
International Coaching Week, Third Full Week in May (Moved from February in 2013) 

American Craft Beer Week, 7 Days Starting the Second Monday in May
World Trade Week, 12 Days Starting Second Monday in May
Children's Book Week, 7 Days Starting Monday of the Second Full Week in May
National Etiquette Week, 7 Days Starting Monday of the Second Full Week in May 

National Transportation Week, Full Week of the Third Friday in May 

Click It or Ticket Mobilization Week, Last Week in May
Mudbug Madness Week, Thursday to Last Sunday in May
Week of Solidarity With The People of Non-Self-Governing Territories, Last Week of May
Hurricane Preparedness Week, Week Beginning the Last Sunday in May 

Recreational Water Illness and Injury Prevention Week, Week before Memorial Day
National Safe Boating Week, 7 Days ending the last Friday before Memorial Day
Old-Time Player Piano Weekend, Thursday to Sunday before Memorial Day 

Moving Holidays in May

National Day of Prayer, First Thursday in May
National Day of Reason, First Thursday in May
Space Day, First Friday of May
International Tuba Day, First Friday in May
International Space Day, First Friday in May
No Pants Day, First Friday of May. No Pants Day is an international holiday observed in several countries on the first Friday in May by not wearing any pants or trousers. Underwear only is recomended.
Armed Forces Day Military-Amateur Crossband Communications Day, First Saturday in May
Bladder Cancer Awareness Day, First Saturday in May
Join Hands Day, First Saturday in May
National Homebrew Day, First Saturday in May
National Day to Prevent Teen Pregnancy, First Saturday in May
National Scrapbook(ing) Day, First Saturday in May
Free Comic Book Day, First Saturday in May
Great American Grump Out, First Saturday in May
Kentucky Derby, First Saturday in May
Mothers' Day, (Hungary, Lithuania, Mozambique, Portugal, Romania, and Spain) the First Sunday in May (2013) * CLICK HERE
National Infertility Survival Day, First Sunday in May
World Laughter Day, First Sunday in May
International Baby Lost Mother's Day, First Sunday in May
Motorcycle Mass & Blessing of The Bikes Day, First Sunday in May
Labour Day, (Queensland and Northern Territory, Australia) the first Monday in May (2013) * CLICK HERE
Melanoma Monday, First Monday in May
Childhood Depression Awareness Day, First Tuesday in May
World Asthma Day, First Tuesday in May
National Teacher(s) Day, Tuesday of the First Full week in May
Occupational Safety & Health Day, Wednesday of The First Full Week in May
School Nurses Day a.k.a. National School Nurse Day, Wednesday after May 6th
Arbour Day (Nova Scotia, Canada), Celebrated on the Thursday of the first full Week of May  * CLICK HERE
Donate A Day's Wages To Charity, Second Wednesday in May
National Night Shift Workers Day, Second Wednesday in May
National Third Shift Workers Day, Second Wednesday in May
Receptionists Day, Second Wednesday in May
National Women's Check-up Day, Second Wednesday in May
Arbour Day (Nova Scotia, Canada), Celebrated on the Thursday of the first full Week of May  * CLICK HERE
Fintastic Friday: Giving Sharks A Voice, Second Friday in May
Cornelia de Lange Syndrome Awareness Day, Second Saturday in May
National Miniature Golf Day, Second Saturday in May
National Windmill Day, Second Saturday in May
Stay Up All Night, Second Saturday in May
National Train Day, Second Saturday in May
World Belly Dance Day, Second Saturday in May
World Fair Trade Day, Second Saturday in May
Letter Carrier's  Stamp Out Hunger Food Drive Day, Second Saturday in May
 International Migratory Bird Day, Second Saturday in May (not to be confused with Bird Day on May 4th or National Bird Day on January 5th)

National Family Child Care Provider's Day,  Friday before Mother's Day
Military Spouse Appreciation Day, Friday before Mother's Day
Birthmother's Day, Saturday before Mother's Day
Mother Ocean Day, Saturday Before Mother's Day
National Babysitters Day, Saturday before Mother's Day
Mother's Day, Second Sunday in May
Mothers At The Wall Day a.k.a Mother's Day at the Wall, (Vietnam Veterans Memorial Fund) Second Sunday in May
Rural Life Sunday, Second Sunday in May (or the fifth Sunday After Easter)
Soil Stewardship Sunday, Second Sunday in May (or the fifth Sunday After Easter)  

Peace Day, Third Sunday in May
National Employee Health & Fitness Day, Third Wednesday in May
Turn Beauty Inside Out Day, Third Wednesday in May
Endangered Species Day, Third Friday in May
International Virtual Assistants Day, Third Friday in May
NASCAR Day, Third Friday in May
Arbour Day (Prince Edward Island, Canada), Third Friday in May (2014) * CLICK HERE
National Bike to Work Day, Third Friday in May
National Defense Transportation Day, Third Friday in May
National Pizza Party Day, Third Friday in May
O. Henry Pun-off Day, Third Friday in May
Mike, The Headless Chicken Day, Third Friday and Saturday in May
Armed Forces Day, Third Saturday of May
Heat Awareness Safety Day, Fourth Friday in May 

Victoria Day (Canada, Scotland), Monday on or before May 24th
National Patriotes Day a.k.a. Journée nationale des patriotes (Quebec), Monday on or before May 24th 

Don't Fry Day, Friday Before Memorial Day
National Wig Out Day, Friday Before Memorial Day
Heat Awareness Day, Friday Before Memorial Day
National Learn To Swim Day, Saturday Before Memorial Day
International Jazz Day, Saturday Before Memorial Day
Julia Pierpont Day, Saturday Before Memorial Day
Amateur Radio Military Appreciation Day (ARMAD), Saturday Before Memorial Day
Neighbor Day, Sunday before Memorial Day
Indianapolis 500, Sunday before Memorial Day
Memorial Day, Last Monday in May
Prayer for Peace Memorial Day, Last Monday in May
Decoration Day previous name for Memorial Day (created by Julia Pierpont), Last Monday in May 

Mothers' Day (Algeria, Dominican Republic, France, French Antilles, Morocco, Haiti, Mauritius, Sweden, and Tunisia), the Last Sunday of May (2013) * CLICK HERE
Día del Arbol (Venezuela) 2013, the last Sunday of May  * CLICK HERE

National Senior Health & Fitness Day, Last Wednesday in May
Dillo Day is an annual festival at Northwestern University, the last Saturday of May
World MS (Multiple Sclerosis) Day, Last Wednesday in May

Moving Holidays Often in May 

Accounting Day a.k.a. Accountant's Day, Dave Varies (May 20th 2013) (not to be confused with International Accounting Day on November 10th)
National Children's Mental Health Awareness Day, Date Varies (May 5th, 2013)
Bats Day in the Fun Park a.k.a. Bats Day, Goth Day, Bats Day in the Park, or Bats Day Out, Date Varies (May 3rd to 5th 2013) (www.batsday.net) 

Rogation Sunday, the Fifth Sunday after Easter, has been known as Rural Life Sunday or Soil Stewardship Sunday
Rogation Days (minor), Monday, Tuesday, and Wednesday preceding Ascension Day
Feast of the Ascension, also known as Ascension Thursday, Holy Thursday, or Ascention Day (Christianity), The Thursday 40 days after Easter (2013)
Father's Day (Germany), The Thursday 40 days after Easter (2013) * CLICK HERE
Pentecost a.k.a. Whit Sunday, Whitsun, or Whit, especially in England, where the following Monday was traditionally a holiday. Seven weeks (or 50 days) after Easter Sunday
Trinity Sunday, First Sunday after Pentecost  

Shavuot, Sixth day of the Hebrew month of Sivan (late May or early June).
Yom Hashoah a.k.a. Holocaust Remembrance Day, or Holocaust Day (Israel),  The 27th of Nisan in the Hebrew Calender, unless adjacent to Shabbat, in which case the date is shifted by a day.
Chanukah - December 16 - 24, 2014
Yom Ha'Atzma'ut a.k.a. Israeli Independence Day (Israel), The 5th of Iyar in the Hebrew Calender (Moved Earlier if the 5th is a Saturday)
Lag B'Omer (Jewish), 18th day of the Hebrew month of Iyar, The birthday of Jewish mysticism, begins at sundown