ReadyCheck have hired out a central London bar, and have a license from Blizzard to show the livestream of the entire con at the event. They've also managed to get various great prizes from sponsors such as Curse, AskMrRobot, Multiplay, Enjin and Logitech. There's no entry fee, so all you need to do is get yourself to Mayfair, central London, and bring some pocket money for a lemonade and a plate of chips. If you want lemonade or chips, that is. If you don't, then it's absolutely free.
The only note is that, of course, it's a bar. So if you're over 18, no need to worry, but if you're under 18 it's probably a smart move to attend in the company of someone older, and anyone under 16 will need to drag along a parent or guardian. I think it's great that people have the time and energy to put these sorts of things together for the EU community, and I hope it's great fun!