The Wedding Party (1969)

Synopsis
This dark comedy finds Charlie (Charles Pfulger) traveling to stay at the house of his fiancee's parents two days before his wedding to Josephine (Jill Clayburgh). With his two friends, he discusses Vietnam, the sexual revolution, black power, and compares bachelor life to that of a married man. Charlie tries to talk Josephine's former suitor into resuming his quest, is propositioned by the church organist, and misses his own bachelor party before finally making to the wedding at the insistence of his friends. Robert De Niro plays the role of Charlie's friend Cecil in this unusual comedy with lots of improvisational dialogue. ~ Dan Pavlides, All Movie Guide