Actual rat events are all pretty much listed on here as there are hardly any. The "Rat & Survival" and the "Ace Cafe rat review" being the public ones (there was an autum rat and survival but i dunno if it's happening again), then there are a few smaller in-house ones for folks birthdays and the freeze-up and any other shit we can find to celebrate for the regulars on here.
Also i think mattblackrat.com does one as well (though never been myself as it's waaaay dahn saaf i think) which i believe is public.
And our cousins over in europe do a few events and are always real pleased to have a visit from the drunken island retards. Though there's only the DHR in holland that i know of being a public event (voodoo will no doubt correct me if i'm wrong on that).
As for Non-rat events. I've never found one that had a problem with me turning up on a shitheap, here's a fantastic list of rallies:
http://www.cernunnos-mcc.org/whatson/
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HOW TO FILL IN YOUR WHEELS:
http://youtu.be/DSH65_7wVQo
FORK DIAMATER LIST:
http://www.customfighters.com/forums/showthread.php?t=17555
The RATMAP (fixed by FatChris):
http://maps.google.co.uk/maps/ms?hl=en&gl=uk&ptab=2&ie=UTF8&oe=UTF8&msa=0&msid=113266916181249522070.000481725dd77e20112bd
MOT REGULATIONS:
http://www.motuk.co.uk/manual/mc_contents.htm
BEARING COMPARISON CHARTS:
http://www.bikebearingshop.co.uk/C4.htm
HEADSTOCK BEARING COMPARISON (props to big mick):
http://scandalon.com/2009/06/motorcycle-steering-stem-bearing-size-chart/