One of the great resources for ideas of what to do in Utrecht is the website Gratis In Utrecht (Free in Utrecht). Every week they post a listing of free events in town, ranging from lectures with free food to free disco nights.

For example, one of the weekly free events is the Vitamin ACU Disco that is held every Friday night at midnight. Entrance is free and drink prices are reasonable. The music covers a range of styles, including hip hop, gothic, punk, '80s, ska and more. The ACU Political and Cultural Center has a range of events and information on a regular basis. Definitely check out their website and program list for all that they offer. ACU is located at Voorstraat 71, Utrecht, not far from the Neude square.