Straw Hat Day is an informal springtime celebration when people switch from winter headwear to lighter straw hats. It is observed by anyone who enjoys seasonal fashion, vintage style, or simply wants a cheerful excuse to welcome warmer weather. The day carries no official registry or governing body; instead, it spreads through social media, local…

HG Awareness Day is an annual global campaign held on May 15 to spotlight hyperemesis gravidarum (HG), a pregnancy complication marked by relentless nausea, vomiting, and weight loss that can exceed typical morning-sickness severity. The day unites patients, clinicians, and advocates to amplify recognition, reduce diagnostic delays, and push for evidence-based care that protects both…

Wear Purple for Peace Day is an informal observance that encourages people to dress in purple as a visible statement against violence and hostility. It is open to anyone who wishes to express solidarity with peace-building efforts, regardless of nationality, faith, or political affiliation. The day exists to create a low-barrier, highly visual way for…

World Information Society Day is a global observance that highlights the role of information and communication technologies (ICTs) in shaping economies, governance, and daily life. It is marked each year on 17 May to remind governments, businesses, and citizens that equitable access to information tools is essential for inclusive development. The day is aimed at…

NF Awareness Day is an annual observance dedicated to increasing public knowledge of neurofibromatosis, a set of genetic disorders that cause tumors to grow on nerve tissue. The day unites patients, families, clinicians, and advocates in a shared effort to accelerate diagnosis, improve care, and fund research toward effective treatments. While the tumors are usually…

National Mushroom Hunting Day is an annual spring observance that encourages people to head outdoors and safely search for wild mushrooms. It serves as a reminder of the ecological, culinary, and educational value of fungi while promoting responsible foraging practices. The day is geared toward hobbyists, nature educators, families, and anyone curious about the natural…

Pinot Grigio Day is an annual celebration dedicated to one of the world’s most popular white wines. It invites casual sippers, sommeliers, and industry professionals to pause and appreciate the crisp, food-friendly style that has made the variety a fixture on restaurant lists and home refrigerators alike. The informal observance lands in early May, a…

World Hypertension Day is observed every May 17 to draw global attention to high blood pressure, a condition that silently damages hearts, brains, kidneys, and eyes while often causing no symptoms. The day is primarily for adults, health-care providers, policy makers, and community leaders who want to prevent, detect early, and control hypertension through coordinated…

Send an Electronic Greeting Card Day is an informal observance encouraging people to share digital goodwill through e-cards. It appeals to anyone who wants a fast, free, and environmentally light way to stay in touch. The day exists because paper cards still carry emotional weight, yet modern life rewards speed and sustainability. Electronic greetings bridge…

World Metrology Day is an annual global observance held on 20 May to celebrate the importance of measurement science and its role in scientific discovery, trade, health, and environmental protection. It is intended for scientists, regulators, industry professionals, educators, and anyone who relies on accurate measurement in daily life or work. The day coincides with…