Crown Valley Community Park will host "The Hop," a 1950s-style dance for disabled young adults, ages 13 to 22, from 7 to 9 p.m. Saturday. Participants must have a permission/medical form on file to attend. The event costs $3. Crown Valley Community Park is at 29751 Crown Valley Parkway. To volunteer or for event information, call (949) 707-2686.