Really don't mean to debate on this...but I've got family commitments too..so do several speakers and people who volunteer their time for all the events we do on weekends, saturdays. As an organiser i even do not get time to learn from the talks like others do, just on my feet all the time dealing with logistics. All I expect is some understanding from the user community - when you get things for free there are some tradeoffs, doing it off hours is one of them. Please do respect the fact that the rest of us do have families and do put in time/commitment to do it.