Nitro Circus Live comes to London's O2 this weekend and we've got four pairs of tickets to give away for Sunday's must-see event. This is your chance to join Travis Pastrana and friends at the biggest action sports show on the planet, featuring insane stunts from the finest in motocross, BMX, skateboarding and much more.Saturday has already sold out, so grab your chance to see the hottest show in town courtesy of Nitro Circus and VICE Sports. To enter, simply fill out your details below. You'll need to be 18 or over, a UK resident, and free to attend the O2 on Sunday 7 February (doors open at 13.30). For full terms and conditions click here. For more info on Nitro Circus check out their website and follow them on Twitter.