There's no doubt about: there is an enormous amount of activities taking place in Groningen every month. Unfortunately for any students in a financial crisis not all of these are for free. The good news is, that Preipop definitely is!
Preipop is a two-day music festival, which presents 12 young bands to the public in Groningen. They play divided over two stages, one for the party hearted and one for the layback public. The festival is organized in the building of student association Cleoptra, so you'll even get a chance to take a sneak peak over there!