Todays Circuses and theaters are not the same as ancient times. In ancient times circuses and theaters were places of debutchery.
Todays circuses are made for kids, Clowns jugglers and acrobats very harmless. If you dont have a kid it doesnt even pay to go.
Theaters it depends on the show, There are shows that are perfectly clean like Mary Poppins or the Lion King and there are shows that are not.