Sock hop
A sock hop or sox hop, often also called a record hop or just a hop, was an informal dance event for teenagers in mid-20th-century North America, featuring popular music.
The term sock hop came about because dancers were required to remove their shoes to protect the varnished floor of the gymnasium.
History
In 1755, Samuel Johnson defined hop as "a place where meaner people dance." In America by the 1800s it came to mean "a dance where there is less display and ceremony than at regular balls",and later "a social event at which people mix together and dance in an informal way."
Sock hops were held as early as 1944 by the American Junior Red Cross to raise funds during World War II. They then became a fad among American teenagers in 1948. Sock hops were commonly held at high schools and other educational institutions, often in the school gymnasium or cafeteria.
The music at a sock hop was usually played from vinyl records, sometimes presented by a disc jockey. Occasionally there were live bands. In later years, "hops" became strongly associated with the 1950s and early rock and roll. "At the Hop", a song by Danny & the Juniors that debuted in 1957, names many popular and novelty dances and otherwise documented what occurred at a hop.
In subsequent decades, with the widespread popularity of sneakers and other types of indoors-only footwear, the practice of removing shoes was dropped. The term then came to be applied more generally to any informal dance for teenagers.