Everything that Laura aka showtunetrivia said below is spot on. The American Cinematheque produced this screening and talkback and they do them regularly (not always musicals, of course). Sign up for their newsletter. Also check out the Cupcake theater in North Hollywood; they have a small theater but do a lot of solid productions (not on a grand scale). And the Celebration Theater has embraced popular titles with LGTBQ elements in them; next up is The Producers. They've done some very solid work the over the past five years. Pasadena Playhouse has a new production of Little Shop of Horrors starting next month and you can get tickets to that on Goldstar. The Musical Theater Guild in Glendale is indeed adventurous and somewhat unpredictable in its level of success but they do produce rarely seen material. Rockwell in Los Feliz and Vitello's in North Hollywood both regularly feature musical theater nights, so check out their calendar. Catalina Bar and Grill often hosts musical theater performers--Ann Hampton Callaway, Liz Callaway, Megan Hilty, Laura Benanti, Adam Pascal have all played there. The Annenberg has an excellent (if expensive) series of solo performances by musical theater heavyweights as well as their occasional productions of musicals. Every Christmas they have a Broadway star doing a Christmas show (Megan Hilty, Amber Riley, Liz Callaway) which has become an annual tradition for me. So there are a lot of places to go for a regular diet of musical theater in L.A.