That I know of planned in the UK this year:
Bournvile Musical Theatre Company is proud to present CHESS, THE MUSICAL, an Amateur Production, By Arrangement with SAMUEL FRENCH LIMITED, on the 2nd to 6th June 2009 at the Crescent Theatre, Birmingham.
The Lowestoft Players are producing Chess the Musical at The Marina Theatre, The Marina, Lowestoft, Suffolk from May 19th 2009 to May 23rd 2009.
(though there's nothing on their website yet).
Other than that it's a bit of a desert for performances in the UK this year.