Circle Theatre is a long-running community theatre based on the Aquinas College campus in Grand Rapids. Its programme usually mixes musicals, plays, comedy, and concert-style performances, with the scale and informality of a local arts venue rather than a large downtown house. That can be a strength: productions feel close to the audience and ticket prices are usually approachable.
It is a selective stop for visitors, but a useful one if you are in town for an evening and want to see Grand Rapids through its local arts scene. Check the season before going, since the theatre is performance-driven rather than a daily attraction. Pair it with dinner in Eastown or another nearby neighbourhood.