April 16: Holidays, Historical Events, Famous Birthdays & Zodiac Sign
April 16 is officially Foursquare Day — chosen because four squared equals sixteen, making it the nerdiest math holiday on the calendar.
About April 16
April 16 leans into its mathematical charm with Foursquare Day, a celebration born from the simple fact that four squared equals sixteen. Social media enthusiasts and math lovers alike embrace the date, which gained traction thanks to the location-based app Foursquare and its community of dedicated users who saw the perfect numerical synergy.
Foodies have plenty to celebrate too. National Eggs Benedict Day honors the brunch classic of poached eggs and hollandaise, while International Pizza Cake Day invites a bizarre culinary mashup. Meanwhile, the Day of the Mushroom gives fungi fans their moment in the spotlight, celebrating everything from culinary shiitakes to the ecological marvels of mycelium networks.
More reflective observances round out the day. National Healthcare Decisions Day encourages adults to document their medical wishes, while College Student Grief Awareness Day supports students coping with loss. Aries energy — bold, pioneering, and direct — fittingly underscores a date that asks people to be proactive about hard conversations and bold choices alike.
Fun & National Days on April 16
- College Student Grief Awareness Day — Reach out to a college student who has lost someone — your support matters more than you know.
- Day of the Mushroom — Cook with a mushroom variety you've never tried before — oyster, lion's mane, or enoki await.
- Foursquare Day — Check in somewhere fun and appreciate the math: four squared equals sixteen, and that's worth celebrating.
- Get to Know Your Customers Day — Business owners, ask your customers one genuine question today — you'll learn something valuable.
- International Pizza Cake Day — Embrace the glorious absurdity of pizza meets cake and throw a party no one will forget.
- National Ask An Atheist Day — Foster open, respectful dialogue about belief and non-belief — curiosity beats assumptions every time.
- National Bean Counters' Day — Thank an accountant or bookkeeper today — they keep the world's numbers honest and organized.
- National D.A.R.E. Day — Reflect on drug education and healthy choices for young people in your community.
- National Eggs Benedict Day — Treat yourself to poached eggs and hollandaise on English muffins — brunch perfection achieved.
- National Healthcare Decisions Day — Take ten minutes to document your medical wishes — it's a gift to your future self and loved ones.