this might be a little off topic, but what sort of programming languages, and other skill requirements are most popular at these sort of events? As a programme

this might be a little off topic, but what sort of programming languages, and other skill requirements are most popular at these sort of events? As a programmer who wants to work for (and perhaps start) a startup in the future, I'm interested in what technologies, skills etc are most common. I do ASP.NET at the moment, but this is more enterprise than startup I believe. If this is totally the wrong spot let me know, but I'd imagine if I rocked up to this event, and everyone was doing Rails I'd be useless to most?