I used to work for a top strategy house that would wheel out the drinks trolley each Friday evening.  In principle, this sounds like quite a nice gesture.  However the reality was very different.  It was effectively a ploy to keep people in the office for a few hours longer.  "Great", I would think to myself every Friday at 6pm, "after 80 hours in the office that's just what I need - feeling obliged to spend another 3-4 hours 'socialising' in this place".  And just to clarify, slipping out early wasn't an option - this place had a 'collegiate' atmosphere and to do so would have been career suicide.The other type I used to love were the events they would organise on Saturdays.  I'd be thinking, "this is my personal time, guys - why are you organising work events on a Saturday??".  I could have been out mowing the lawn, taking my kids to a theme park, doing a bit of sport, catching up with friends and relatives, but no - I'd be pretending to enjoy some kind of 'business game' in a sterile air-conditioned conference room or similar.  Other people thought the same as me, but we were all too afraid to speak out back them - there was a bit of an 'anxiety' culture thing going on.So, my advice?  Simple - organise the event during work hours!