National Yo-Yo Day is observed annually on June 6, celebrating the iconic toy that has a history dating back to at least the 5th century BC. The modern yo-yo, consisting of two discs connected by an axle and a string, became popular in the early 20th century, particularly after Pedro Flores established the first manufacturing company in 1928. Donald F. Duncan Sr. later popularized the toy through competitions and is often mistakenly credited with its invention. The day was created in 1990 by Daniel Volk, a former yo-yo demonstrator for Duncan Toys, to honor Duncan’s birthday. Celebrations typically involve buying a yo-yo, learning new tricks, teaching others, and hosting competitions. Enthusiasts are encouraged to share their experiences on social media using the hashtag #NationalYoYoDay. Notably, the National Yo-Yo Museum in Chico, California, serves as a significant location for those interested in the history of the toy.