Quality time gift ideas

I want to get my parents (60s & 70s) something to do together with us for Christmas. There will be four of us and they have a lot of interests and are open to most events! The only hinderance is my mother has an injured knee right now so I need an idea that isn’t a lot of walking or stairs.

My first thought was a blues game but I can’t find any accessible seating and even then I think it’d be a lot of walking.

What are some ideas of things you do around St. Louis that you love doing with others? Any events in December/January that you love? I’ve googled this so many times, trust me. But I’m just not getting anywhere with it. Thanks!