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After the loyal toast
Defenestration - a suitable victim is grabbed by at least two accomplices and hurled at the curtains. If everything goes to plan, a pot-holer will have snuck out and silently opened the window behind the curtain (a window where the runners had been pre-greased before the dinner). If the miscreants are feeling particularly generous, there will be a mattress or similar outside the window.
Needless to say, should the pot-holer be delayed, or open the wrong window, or the accomplices select the wrong window, or..., or....
The exercise has the benefit (or otherwise) of showing how good the miscreants are at planning, and executing said plan.