Anand
Carlsen
Topalov
Morozevich
Ivanchuk
Radjabov
Nakamura
Adams
Short
Howell
Jones
Wade
Guaranteed entertainment and good challenge for the English players. No Kramnik or Leko, I find a lot of their games pretty dull. But I'd invite Kramnik if Wade turned down his invitation or I could step in to break a world record
I chose to have current active players only so no Kasparov or McShane, for example.
12 player all-play-all seems to be a popular format so I chose that for mine but any format is up to you.
I wonder how much it would cost, I've no idea how much appearance fees are for any of the players but if I were the sponsor I'd make the players earn their money by having high prizemoney only.