On the non affiliate side of things there are also several more but it depends what you are targetting – Here are a few off the top of my head
General
ICEi – London Jan
EIG – Copenhagen Sept
Sports
Bet Markets, March, Vienna
The Betting Show, Nov, Birmingham
Bingo
The Bingo Summit, June, London
Poker
World Poker Congress, June, Portugal
Asia
AIG, Feb, Macau
G2E Asia, June, Macau
Legal
Legal Gaming in Europe, Jan, London
European Gambling Briefing, April, Budapest
Asian Gambling briefiing, Oct, Singapore
Mobile
Mobile Gambling Summit, Nov, London
General Affiliate Events
a4uExpo Europe, April, Amsterdam (CAP Euro backs on to this)
a4uExpo, Oct, London
All the Ad Techs
Affiliate Summit, USA
Pubcon, Nov, Vegas
If you are based in London, iGaming Business (the company I work for) puts on industry socials every 8 – 10 weeks – This is also quite a good site for evenst (although it covers landbased as well and not so much affiliate events. http://www.gamingfloor.com/confexs/2009.html