If you love live theater productions, book yourself some tickets for a play or other stage show at Choucrouterie Theatre. Look online to see what's still available.
You'll have no end of sightseeing choices in City-Centre - Petite France. Choucrouterie Theatre is an ideal place to start here, but there are plenty of other worthwhile sights to discover. Strasbourg Cathedral, Zenith Strasbourg, and European Parliament are not far from the arts and culture attraction and and will cap off your day nicely.