Wogan will join John Torode and Gregg Wallace as an Invention Test judge for a competion that will see show visitors produce a dish in 30 minutes from a box of mystery ingredients.
Organsier BBC Haymarket will donate all of the proceeds from the sale of the remaining ten Invention Test places, and the audience seats for the session to charity Children in Need.
In addition they will also donate 10% of the MasterChef Restaurant proceeds on Friday 13 November to Children in Need and 50 pence per ticket for every full paying adult ticket bought on the door to the show on Friday.
Wallace said: "We'll also ask the audience to the Invention Test to make a pledge for whom they think is going to win and all money collected will again go to Children in Need."
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