Back from vacation. Had a good time, but could use a vacation from my vacation. For a week, I was on my own with the kids. The program I was at had children's activities during the day, and evening babysitting, but that still left me with maybe 6 hours a day with the boys.
The main issue is that there were a lot of kids who were a few years older than D, whose parents gave them a lot more freedom than I was willing to give D, so he was testing the limits every few minutes. And whenever I let him do something, N wanted to do it as well, so if D wasn't arguing with me, N was. And neither of them quite got the concept that I'd want to have a conversation with other adults over meals.
D also desperately wanted to play with the older kids, especially when they broke out pokemon cards and a portable game machine, but mostly they saw him as a "little kid" and weren't interested. It did help a little when I borrowed Munchkin Fu from someone who was attending, and he was able to demonstrate his ability to play complicated games.
It made me realize that D has a lot more experience playing with younger kids than with older ones. I had D when I was 29, so few of my friends have older children, and mothers groups tend to attract parents of younger children more than school-age kids.