We just got back from the March 19 Eastern and there was a member event. I got there about halfway through, so if there was a "mixer" I missed it. They were asking trivia questions and giving away Vacation Club merchandise, group ended up with something. When we were speaking with an onboard representative prior to the event she asked if we were cruising on points, which we were, and said we would get an invitation, so I don't know if you need to be cruising on points, but it was listed in the navigator so you could probably go in any event (ours was from 10 to 11 am either our first or second day, which are both sea days on the Eastern)