For instructions on finding reviews in two newspaper databases, please see below.
Use Lexis Nexis Academic to find reviews from 1980 to the present. Finding reviews in Lexis Nexis is a fairly complicated process, so please follow the steps below.
To find reviews in the New York Times from 1851 until three years ago, use ProQuest Historical Newspapers. Try searching for the name of the show and the playwright or director in Advanced Search. Limit to Reviews under Document Type. If you don't find anything, try also limiting by date.