UK Conventions 2012 (Updated)

New announcements shown in bold.

BBC: Official Doctor Who Convention (24th-25th March 2012 at the Millennium Centre, Cardiff)
Guests announced so far: Matt Smith, Steven Moffat, Arthur Darvill, Stuart Milligan, Simon Fisher-Becker, Mark Sheppard, Ian McNeice, Raquel Cassidy & Toby Haynes.

Massive Events: The Hub 8 (13th-15th April 2012 at the Park Inn, Northampton)
Convention for Torchwood.
Guests announced so far: Gareth David Lloyd, Kai Owen & Catherine Tregenna.

Rogue Events: Asylum 8 (18th-20th May 2012 at the Hilton Metropole Hotel, Birmingham)
Convention for Supernatural.
Guests announced so far: Jim Beaver, Mark Sheppard, Mark Pellegrino, Steven Williams, Misha Collins, Kim Rhodes , Jared Padalecki, Jason Manns, Jim Michaels, James Patrick Stewart & Matt Cohen.

Massive Events: The Games (8th-10th June 2012 at the Hilton Metropole Hotel, Birmingham
Convention for The Hunger Games.
Guests announced so far: Dayo Okeniyi.

Rogue Events: Insurgence 4 (22nd-24th June 2012 at the Hilton Metropole Hotel, Birmingham)
Convention for The Vampire Diaries
Guests announced so far: Daniel Gillies, Paul Wesley, Ian Somerhalder, Steven R McQueen,  Malese Jow & Torrey DeVitto.

Massive Events: Bitten 3 (17th-19th August 2012 at the Park Inn Hotel, Northampton).
Convention for True Blood.
Guests announced so far: Nelsan Ellis & Dennis O'Hare.

Massive Events: Hallowhedon 4 (26th-28th October 2012 at the Radisson Edwardian Hotel, Heathrow)
Convention for fans of Joss Whedon.
Guests announced so far: Sean Maher, Kristine Sutherland & Nicholas Brendan.

Rogue Events: Die Zombie Die (26th-28th October 2012 at the Hilton Metropole Hotel, Birmingham)
Convention for The Walking Dead

NB: This is not a definitive list of events being held in the UK -please check the Organisers' websites for details of additional events.