Conversation so far:
When did Bill Cosby start stand up comedy?
Bill Cosby appeared at The Gaslight Cafe beginning in 1961.
Where was Bill Cosby doing stand up comedies?
Bill Cosby lined up stand-up jobs at clubs in Philadelphia and then in New York City.

Question: Where did he perform while in New York?
Self-contained rewrite: Where did Bill Cosby perform while in New York?