If you're a fan of live theater performances, catch a play at Erkel Theatre. Check online to see what's still available.
You'll have no end of sightseeing choices when staying in Jozsefvaros. Erkel Theatre is an ideal place to kick off here, but there are loads of other worthy places to discover. Buda Castle, Gellert Thermal Baths and Swimming Pool, and Parliament Building are not far from the arts and culture attraction and will round out your day nicely.