23rd Annual Labor Day Police Challenge will be held at Delray's Municipal Beach at Atlantic Avenue and Ocean Blvd. (A1A). Police Departments from Delray Beach, Boca Raton and Boynton Beach will compete for trophies, cash prizes and bragging rights. Games begins at noon. Awards ceremony at 3 pm at Boston's on the Beach, 40 S. Ocean Blvd. 441-2400.