What I did at dev1
I was involved in both dev1 and the modular forms school; I'll divide what I did into two groups, though I don't know if the division is that meaningful.
dev1
I was really loud when necessary.
As with most sage conferences, I spent most of my time working on a large project I hadn't intended to at all, and hadn't looked at before the conference started. In this case, it was coercion. I've just been trying to help update various parts of the codebase now that the core coercion model works. I helped with various pieces here and there, but probably my largest contribution was getting the doctests in sage/modular/ working -- I'm mostly done, and hope I can finish by 4PM today. I'm going to finish off anything that's left over the weekend, and will try to help with the fallout of the doctest timings and pickle jar.
I also provided excellent moral support for Rob and Mike when they did the crazy 3.0.3 merge, and snored from the sidelines the whole way.
I fixed or worked on fixing various bugs that have been on my todo list for a while. My code for #2535 is now mostly done, and I should finish that up this weekend. Nick Alexander and I talked about #2329, and we've agreed on what the right strategy is, and that should also be finished up this weekend. Rob Bradshaw and I tracked down a nasty coercion bug. There were a handful of others I don't remember right now.