benefit, fund-raiser

ball, dance, formal, prom

celebration, gala, occasion

bacchanal, bacchanalia, orgy, saturnalia

bake, clambake, cocktail party, hen party, house party, housewarming, icebreaker, kaffeeklatsch, kegger (also keg party), klatch (also klatsch), masquerade, meet and greet, mixer, salon, shower, social, soiree (or soirée), stag, supper, symposium, tea, tea party