It would be interesting to know some other sources: [...] number of attendees to e.g. Utrecht
summer school on FP, ...
Just a bit over 30, I think. And it was interesting to see a significant number of non-student participants. Perhaps around 20%.
As an aside, we had some interesting projects, too. Sokoban in curses, DSP/sound DSL, regex visualization, Bash code escaping, etc. I hope to see some of them appear on Hackage soon.