I have only done dinners for FT but, for another online group of friends, I did whole weekend events. I guess the biggest reason I stopped organizing was that you always seem to be in demand and can't really enjoy the activities yourself. That and the fact that there will always be people complaining about one thing or another. They really don't realize the time and effort that you put into organizing these things, or how difficult it can be to try and arrange things that will be acceptable to the majority.