Received an e-mail the other day announcing the launch of London Restaurant Festival. The festival is in October and I think they've got some really great sounding events planned.
They are a bit on the expensive side, but if I can save enough pennies then I'm hoping to definitely go to the 'Big Roast' at Leadenhall Market, which features chefs such as Mark Hix, Fergus Henderson and John Torode cooking a Sunday roast.
The other one that sounds good is the Gourmet Odyessy where you have your starter, main and dessert in a different restaurant. However at £130 a ticket it might be beyond by price range.