Illegal raves tend to be a great problem for the police, and whether police can shut them down or now mostly depends from the number of ravers.
Around 200 people were attending an illegal rave last night in north London, when according to the BBC, police arrived to block the party. One man, age 19, was taken to hospital after being stabbed in the disorder and riot police were deployed to deal with the violence.
According to witnesses, machetes and swords were found nearby.