Over on the Orbital Comics website they have details of an Alan Moore signing to celebrate the UK release of The Mindscape Of Alan Moore.
(Of course, it's actually been available in pretty much any comic shop since last year it seems, but such is they way these things work).
Alan Moore & Dez Vylenz
24th May 2008
Expect this one to sell out really fast.
(hat-tip to Rich Johnston for this one)