I write this two days after we've submitted our hackathon project, MLH Township. The original project idea was to make an RPGesq web game, where you could find people throughtout the fellowship by walking around on the map, and play mini-games and have discussion rooms where you could talk about different topics or ongoing MLH Events.
As it usually is the original idea proved to be far trickier than I had initally expected, and we barely managed to scrape together by the end of the hackathon a very simple version of the original idea.
I didn't contribute a whole lot of code to the projcet, both because I was pretty sick and because I didn't know either of NodeJS or React (which the project is written in). I did get to know however a lot about websockets and webRTC and how to use them in an actual project which was great.