Finding tech meetups in your area can be surprisingly difficult, and even when you know a group exists, working out when they actually meet can be a puzzle. Some of them have frankly bewildering scheduling rules.
John Sutherland solved this problem for the Edinburgh tech community by listing when various groups meet and who they'd be of interest to. With his permission, I've done the same thing for London tech meetups.
If your meetup isn't listed and you'd like it to be, drop me an email at craig@barkingiguana.com.