What is the fine-grained topic of the following text: Over 50 theatres include Stratford, Shaw, Blyth, and other area festivals, Huron Country Playhouse, The Grand (and McManus) Theatre, Theatre on the Grand (Fergus), Sanderson Centre, Theatre Orangeville, Theatre & Company, Lighthouse, Dundas, Aquarius, and links to other stages in Southwestern Ontario (even -ye gads- Toronto), with a growing collection of reviews. Only return the topic.
Theatres and theatre festivals in Southwestern Ontario.