I think the best giveaway would be to make it truly optional and to pay people for their time. I'm another one who really dislikes being forced to use my personal time to have 'fun' with coworkers. I'll do the occasionally happy hour, but I would not attend a three day weekend at a resort, even if it was mandatory.

I wonder if it would be possible to have two tracks, one that was an optional resort and one that covered the same material during normal working hours?