We had something like 18 people with half a dozen spouses. It was at a local bar. There happened to be live music that night... which made it a bit too loud to talk.
After drinking there for 4-5 hours, ten of us moved to the bar next door because they still had food and stayed there till nearly closing time.
None of my close friends came.. which forced me to get to know the other people in my class. Most were really bitchy and jerks and a-holes in HS, but seemed reasonable now. Some turned out to be actually friendly.
I'd kind of like them to set up small yearly events.