Not many people know about this place. That has multiple reasons: It's a hide out (they did that well) and there's not an agenda with weekly events. You have to be lucky to walk into a party in De Vondelbunker, or you have to know someone that knows someone that organizes something..
There's not many parties in De Vondelbunker, but when there is one, you'll never forget that you went. De Vondelbunker is located in an old atom hide out that dates from 1947, which sets just the right atmosphere for the parties that are randomly held there. Entrance is always free.
If by any chance someone has made an agenda, you'll find it here: http://schijnheilig.org/kalender/