Cabin fever is awful! I had it bad during my recovery and even though I'm an avid reader I could NOT focus enough to read. Have you tried binge watching a new series? The Crown on Netflix is really good as well as The Missing (Starz). Both kept me interested and wanting more. There are also some good movies to rent right now; Hidden Figures, Lion, LaLa Land are a few I've enjoyed.
Theater seats would be hard at this point. So I'd say hold off on church for a while, your leg still couldn't handle being down for an hour. When I finally was able to return to church (2.5 months) I still propped my leg up on a chair beside me.