We've had a few in the past year: 2 in Manchester,
1 in Birmingham, and all
the London ones. There are no regular ones other than the London ones. I
don't think there's enough interest to be honest... I wouldn't be interested
in any soon (I've just been to Wikimania so that may be the reason...)
The northern ones generally involve people travelling significant
distances, which makes regular ones less likely. I would be interested
in more on occasion, though. I'm away from the north for the summer,
but I might try and organise one for October. I may attend one of the
London ones before then if I can.