I like being around other people who like the same things I do. My DH enjoys the results of my quilting, but he can't relate to the challenges or the fun of the creation. I also find the focused time is very beneficial. I know there is nothing else I need to do but sew, take breaks when I want to, eat someone else's good cooking, and sleep when I want. It is quite liberating. I am not a person who can have just one project though. If I concentrate too long and hard on one thing, I end up making mistakes! I bring one big project and two or three little ones. The small ones are frequently small gifts or charity projects. I also bring my Kindle and read some to take breaks.
The only real problem I have is ergonomic. I have discovered I need to bring my Gidgit table and my own chair. The folding tables and chairs supplied by my American Sewing Guild organizers just kill my back after a bit.
Pam