Some members do arrange "get togethers" before they leave the UK but you also get people who just bump into each other as well.
It's a small world, especially when you're on holiday (Kalami more than most places).
Some folks, like myself, have used photo avatars, so therefore get recognised in resort sometimes. I always say to anyone to be sure to come up and say hello, and we can share a beer (or two)
There were also folks making up CTG T shirts a while back, but I don't know if that idea aver took off in reality.