There is a ridiculous amount of action going on in London.  As of May 30th, the city will have the most bitcoin ATM's in the world, and these conferences are coming up:

2014-05-27  Digital Money 2014
2014-06-11  PayExpo
2014-06-18  Boatcoin Expo
2014-07-01  WIRED Money
2014-07-10 CoinSummit
2014-09-15  Inside Bitcoins