The Collective Noun For Geo People Is A GeoMob
The Greek Philosopher Heraclitus was fond of saying "the only constant is change" (actually he said "nothing endures but change" but let's not split hairs). He probably wasn't talking about meetups and get-togethers in London but this still fits rather well. Events come and go as their themes either go mainstream or fade. But some remain and London's #geomob is one of those.
Started in 2008 by fellow WhereCamp EU co-conspirator Chris Osborne, #geomob was conceived as London's answer to Silicon Valley's popular (and still running) WebMapSocial meetup group. After a brief hiatus in May 2010 when Chris hung up his hat and offered the event to anyone willing to spend the time and effort in running it, #geomob restarted in September of the same year, this time fed and watered by Ed Freyfogle and Vuk Trifkovic of Lokku, the people behind Nestoria and Open Cage Data. It's been going strong ever since.
