I'm wondering if some people in this thread are mixing up the member welcome event (usually on the first, sometimes 2nd, day) with the sales pitches aimed at non-members that are held several times during the cruise. The member event usually has alcoholic drinks and sometimes a character meet-and-greet, while the regular sales pitches have only bottled water.
As i18mulan mentioned above, some cruises also have a "member mixer" which is different yet again.