The organisers of Underage Festival are running a new festive event this December - The Underage Festival Festive Knees-Up. The event will feature Rolo Tomassi, Metronomy, Dan le Sac vs Scroobius Pip and a Mystery Jets DJ set. The event will take place on 20th December from 12-6pm at London's Scala and is exclusively for 14-18 year olds