I would keep an eye on the main event organiser sites – I don’t know them but am sure they are in Google
Bullet Business
Clarion Gaming
Also a site called Gaming Floor has a good diary of events although they are land based as well
And then like people said check the events diaries on all the sites – When I do contra deals from now on I will try and remember to post them here as well – Couple coming up are
Gambit on Affiliates – xxxhttp://www.thegambit.info/
Gaming Exec Summit – xxxhttp://www.terrapinn.com/2008/gamingeu/