If you love live theater productions, catch a play at St. Jacobs Scoolhouse Theatre. Look online for scheduling details.
You'll have no end of sightseeing choices when in Saint Jacobs. St. Jacobs Scoolhouse Theatre is a great place to begin here, but there are plenty of other interesting spots to check out. University of Waterloo, St Jacobs Farmers Market, and Wilfrid Laurier University are not far from the arts and culture attraction and will round out your day nicely.