So here is one of my concept attractions for this park: Singin' in the Rain the Musical!
This stage show would be in the 1920's/great depression area. Now, for those familiar with the movie/musical, it was made in the 1950's but it is a movie about the birth of "talkies", or, movies with sound, which happened around the 1920's. I think this would make an excellent show, as it really captures the spirit of the early stages of Hollywood. It would, of course, be a condensed version of the movie, but including all of the songs from the movie.