Goog evening!

I'm going to visit Beijing at the beginning of July 2011 and visit one of the shows of the famous Beijing Opera. Could You, please, inform me on the folloowing points:
1. Will the opera houses be working in July? They may be on vacation or on a tour,
You know.
2. Is it possible to by tickets through the Internet in advance?

Best regards
Rayevskaya Irina
Russia, Ekaterinburg