I created a GetTogether meetup group for us
Unlike meetup.com, it doesn't cost anything to use, and the source code is open. However, it may be rougher around the edges to use, but that's what I thought I'd find out. The link to the group is here, if anyone wants to join (although there are no events there yet).
I named the group "P2P Edinburgh" since it seems a bit counterproductive to try and manage meetups for the whole of Scotland in one group, these being quite localised events. Of course, should a P2P meetup elsewhere arise, we can make another group.