May 19

Boys Club Day, May Ray Day, Mike, The Headless Chicken Day, National Asian & Pacific Islander HIV/AIDS Awareness Day, Neighbor Day, Pentecost, World Autoimmune Arthritis Day, National Devil’s Food Cake Day, World Baking Day, National Quiche Lorraine Day, Pick Strawberries Day

May 18

Armed Forces Day, HIV Vaccine Awareness Day, I Love Reeses Day, International Museum Day, Mother Whistler Day, National Learn To Swim Day, O. Henry Pun-off Day, Visit Your Relatives Day, National Cheese Soufflé Day

May 17

Endangered Species Day, International Virtual Assistants Day, NASCAR Day, National Bike to Work Day, National Defense Transportation Day, National Pizza Party Day, Syttende Mai, World Hypertension Day,  Information Society Day, World Telecommunications Day, World Neurofibromatosis Day (NF Day), National Cherry Cobbler Day

May 16

Biographer’s Day, National Sea Monkey Day, National Coquilles St. Jacques Day

May 15

Hyperemisis Gravidarum Awareness Day, International Day of Families, International MPS Awareness Day, National Chocolate Chip Day, National Tuberous Sclerosis Day, National Women’s Check-up Day, Nylon Stockings Day, Peace Officer Memorial Day, National Employee Health & Fitness Day, Straw Hat Day, Turn Beauty Inside Out Day