The singer has teamed up with Lucky Voice, who will open their venues at 12pm on Saturday, October 27 where fans can hold their own 'Candy' single launch parties.
"I know a lot of my songs are big hits at karaoke so I'm chuffed to be taking over Lucky Voice for a whole day," Williams said in a statement.
"I hope you're all going to do me proud and go mental!"
Participants will sing along to a special playlist of tracks selected by the star, including a never-before-heard track from his new album Take The Crown.
Two people who participate on the day will win a pair of tickets to one of his London O2 shows, which sold out in less than an hour after being announced earlier this month.
To take part either at a Lucky Voice venue or online at home, fans should pre-register in advance at www.luckyvoice.com/robbie, then turn up with their e-ticket from midday on October 27 or log on to luckyvoice.com/sing
Williams releases 'Candy' on October 28. Watch the official music video below: