I sell vintage collage supplies at mixed media art retreats. I'm attending 6 next year. All are on the west coast from Seattle to Phoenix. I really love going to these. At most of them, I can also take classes. For 2, I am the on-site supply store so I am selling for the entire event, 5 to 7 days. Think of it as a convention for mixed media artists.
I fly to a couple with 2 big suitcases and have a few boxes shipped to the hotel.
Yes, these events include airfare, hotel, show fees and sometimes, class fees. Whew!