Organizing a group meeting over the net is horrifically complicated.  
There are just too many variables. It's much easier for a leader to pick 
a date, time and place.  Then the decision process becomes binary.  Can 
I make it or not?   If you can great.  If you can't, maybe next time.

I ran into this problem long ago on usenet on the message group 
rec.aviation.
--
Timothy Aanerud