Just watched this rarity on the A Night at the Opera DVD. It takes place at the title nightclub with many celebrities in attendance. One of them was Groucho Marx, here with then-wife Ruth Johnson, who's seen without his trademark greasepaint mustache and eyebrows. There are also much enjoyable music and dancing depicted. Connee Boswell provides an enjoyable number and then when The Brian Sisters develop stagefright, she also does a nice teaming with them. Unfortunately, there's also an unfunny impressionist and I mean unfunny both in who he impersonates and what lines he gives. Actually, many reviewers here also complained about how low the volume seemed to be so maybe that was my problem as well. Anyway, Sunday Night at the Trocadero is worth a look for the rare chance to see Groucho on film as he really looked off-screen during this period.