National Water Balloon Day is observed worldwide on August 7. Founded by the Newmarket Recreation Department in Newmarket, New Hampshire, in 2019, this holiday encourages people to engage in fun water balloon fights as a way to cool off during the summer. Participants typically gather with friends and family for epic water balloon battles in backyards, near pools, or at beaches. Various games involving water balloons, such as water balloon toss and relay races, are also popular ways to celebrate. The holiday promotes safe play by encouraging participants to follow ground rules, such as not throwing balloons at people's faces. Additionally, the event has gained recognition for its record-breaking water balloon fights, with the largest recorded event involving over 11,000 participants. National Water Balloon Day is a lighthearted occasion that fosters community fun and enjoyment.