Gay for a Day is really two films packaged together. The first (Titled Gay for a Day) is an almost amateurish home move of the 1976 Gay Pride Parade in San Francisco. By today's standards when NY and SF Pride parades have hundreds of thousands of marchers this parade was small and unchoreographed. The men are cute in a 70's way and the novelty is refreshing in a nostalgic way.
The second (Titled Costumes on Review) is a Halloween Bash at a hotel in Chicago. Costumes are as elaborate as any Mardi Gras and the audience is earnestly enjoying the evening. We also hear from the Mistress of Ceremonies both in and out of Drag.
Neither film is great cinema and neither will change your world but it in an interesting time capsule of a period in Gay History that is now gone.