Open Mat Switzerland
Open Mat is a gathering of Brazilian Jiu-Jitsu (BJJ) practitioners that happens every 1-2 months in Switzerland. If you don't have a clue what BJJ is – like most people in Switzerland – Wikipedia, Youtube and other resources may provide some helpful and insightful information. Basically, it looks like a bunch of grossly sweaty guys and girls hugging each other and rolling around on the floor in weird pajamas. In reality, they actually try to choke each other out and break each other's arms and legs. Anyways, go check it out yourself.