"This group will only work if we all take ownership and make it work. The calendar is pretty empty because you don't put anything on it. The same 4 or 5 people regularly schedule events, but can't do everything. Don't complain that there isn't anything to do but not pull your own weight. We are all busy and understand that sometimes things happen, but you still have to participate.
"Every time we have a meeting to discuss how to make this group better, people offer suggestions, but then expect someone else to do all the work. It doesn't work that way. Some people like to plan their whole month in advance and others don't know what they will do from day to day, but there is room for both to be on the calendar.
"So, if you want the group to continue, take a coordinator position or at least try to schedule the activity/quarter that you agreed to when you signed up. The more activities on the calendar, the more to choose from and the more likely we will all find something we want to do at a time we can do it."
Now that I have theoretically offended all but the handful of people who have put a lot of effort into the group, I'll go quietly sit in my corner and think about the family activities I plan to schedule in the next few months.