This website has 5 a year as listed here:
http://www.casinoaffiliateprograms.com/events/
I would say cap spring break and cap euro are must attends. Never attented cap london and that is supposed to be good too…
Otherwise these guys ( http://www.casinoaffiliateconvention.com ) have 1 or 2 a year but they have died downs since CAP has launched their conferences