The controversial left-winger, who was expelled from Labour in 2003, is standing as an independent against the West Bromwich East MP at the next general election.
On September 13 Mr Galloway is bringing his 'Mother of all Talkshows' event to West Bromwich Community Centre, following an appearance in Dudley earlier this month.
He will be joined on stage by UB40s Brian Travers and global policy analyst Adam Garrie.
Mr Galloway said: "There will be laughs and love, rumbustious debate on Brexit and Britain's future not to mention a right lampooning for Donald Trump."
The former MP, who lost his Bradford West seat in 2015, presented The Mother of all Talkshows on TalkRadio until he was sacked earlier this year over claims he had posted an anti-Semitic tweet.
The programme now runs on Youtube, while Mr Galloway also presents a weekly show on Kremlin-funded broadcaster RT.
He has vowed to stand against Labour deputy leader Mr Watson at the next election, accusing him of trying to block Brexit and stop Jeremy Corbyn from getting into power.
A crowdfunding campaign to raise cash for his bid has so far reached £16,000 of its £25,000 target.
His appearance at Dudley Town Hall was described as "humiliating" by Dudley North MP Ian Austin, who claimed less than 200 people turned up at the event in the 1,000-seat venue.
Mr Galloway insists the crowd was "near 250 strong".