I figured out that I don't like organized volunteer work (kinda like organized religion). You can never just volunteer for a specified amount of time. There is the initial meeting to lay out the plan. Then there are the additional meetings to monitor progress and make adjustments. Then once the event is over, there are the meetings to discuss the success or failure of the whole dang thing.
It's just too much. Any volunteer work that will leave people disapppointed if I don't show up is not for me.