There are meetings all over the country, all depends on where you are and how far you want to drive
Us in the south east have the ACE Cafe meet every second Thursday of the month. Quite a few forumers make it down to that. Auto Italia is coming up in June, Brooklands was about a month back. There are a number of meets in the midlands and in the North too.
As Turboned mentioned, check out the events section of the forum for details of all up and coming events.
If you're in New Zealand, pop over to my place some time...
I manage to get to England every couple of years, so I'm sure someone here can make it to NZ occasionally...