Christmas is going to be different. No way around that. (But you can assure the kids that the North Pole has excellent pandemic protocols, so Santa will be able to visit. He and the reindeer will quarantine when they get back to the North Pole.)
Instead of focusing on the things you can’t do (host parties, travel to visit relatives, visit Santa at beautifully decorated shopping malls, go to the Nutcracker or the Messiah sing-along, participate in the church nativity pageant), try to keep the focus on the things you can do – and on finding creative ways to do the things you love.