Nouns

(n)buffoonery, clowning, japery, frivolity, harlequinade, prankacting like a clown or buffoon
(n)antic, joke, prank, trick, caper, put-ona ludicrous or grotesque act done for fun and amusement

Verbs

(v)prankdress or decorate showily or gaudily“Roses were pranking the lawn”
(v)prankdress up showily“He pranked himself out in his best clothes”