The event will take place between 3pm and 4.30pm on the first day of the show, which is being held at Old Billingsgate from 23 to 24 September.
Other special features at this year's exhibition will include Fizz for Events Tasting and the popular Canape Cup.
Previous Tweet Up events have taken place at the Sea Life London Aquarium and the Excite! exhibition at Earls Court.
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