Salsas 3 and 4
One of the differences is that instead of just being an ice cream social, there was also a potluck. So we used it as an opportunity to harvest More Endless Hot Peppers from the garden. We made a salsa verde and an ancho chili sauce (both from The Well-Filled Tortilla Cookbook) and made Christmas-colored enchiladas.

We liked the salsa verde, although I'm not sure how often we'll make it given the tomatillos (not great quality at Kroger) and effort. But we really liked having a non-tomato salsa. Pity there wasn't any leftover (it all went onto the enchiladas); it works really well with chips.
The ancho sauce was, unsurprisingly, MUCH hotter. It's a great way to use up garden ingredients, and I'll make it again, but only for specific dishes where the heat can be countered or baked mellower.
The social aspect
Last year we didn't know anyone, and appeared to be two of only a handful of attendees without kids. This year, there were several people without kids, and we all gravitated towards each other. AND most of them belonged to SNRE or public policy, so even more of a win - they're our nonprofitty-type people :) At least one is even a sci-fi fan, so you know I was relieved to find kin.
So we had a much better time. The circle we were in kept growing. We kept meeting new people. We were social. There was even sorbet, so I could enjoy the ice cream part of the event.
It's definitely interesting how one change in the dynamic completely changes our experience. It is really difficult to insert ourselves into a group of parents who all know each other and are hanging out while their kids play. It's much easier when there are other people with the same obstacle, so we all wind up together instead.
Another thing we've been here long enough to go to again
This year we were at Dancing In The Streets with a couple of other people, and that made a big difference. (It also helped that there were attendees this year, and that they were dancing.) So Arthur got to dance for a while, and he was also a volunteer. He's now a member of the community, rather than a newcomer peering in.
I went with the basic Joy of Cooking recipes. I used the Meringue I for the plain ones (this is granulated sugar), and the Meringue II for the chocolate ones (this is half granulated sugar and half powdered sugar). The chocolate were definitely chewier - in a good way (I thought).