This weekend I participated as a vendor at Holiday on the Hill at Northfield Church.
Sadly I did not get a spot in the gym, and was placed in a secondary room beside it. It still had good traffic though, and I brought a speaker and played Christmas music to liven it up back there. My neighbors were all lovely people and I enjoyed chatting with them throughout the event.
I changed my setup to push everything close to the front, since I've found that people are intimidated to walk inside the booth when things are pushed farther back, eg. a U shape. I sat in the back and knitted while people browsed, and I think it worked out pretty well.