Group photo of the participants in the 1956 State Yo-Yo Championship. The California State Yo-Yo Championship has a long history of being one of the largest state contests in the country. First made popular in the 1920s, yo-yoing remains a popular pastime. It was first invented in ancient Greece. The San Diego Yo-Yo Club remains active and usually meets on Saturdays in Balboa Park in front of the Reuben H. Fleet Science Center. They welcome everyone and suggest items to bring - yo-yos, diabolos, tops, juggling, poi, or any other skill toy.