I'm about as much of a introvert as one can be but I have an idea even though I scorn social events.
So back in the 70's when snowmobiling was becoming very popular my parents would go on large group rides, and I mean 50 sleds or more. They would assemble everyone but it all revolved around several people hauling sled towable carts. A destination would be chosen and once there they would have a large bonfire, cookout and make a day out of it.....often long into the night. The pictures of it looked like a righteous good time.
My in-laws were big into snowmobiling back in the glory days as well. They had a huge group of friends that rode.
I remember my father-in-law telling me about a trip they took to the UP and back in the 70's and what a production that was. It took them several days, one guy would pull a trailer with fuel cans, another person with a truck and trailer to pick up the broken sleds, etc. etc. Had to be a blast.
We were discussing this as I was telling him that I ride to the UP and back (350ish miles) in a day solo, with 2 stops for gas. lol