In Thor: Ragnarok movie, when Thor first met Korg:
Thor: How did you end up here?
Korg: Well, I tried to start a revolution, but didn't print enough pamphlets so hardly anyone turned up. Except for my mum and her boyfriend, who I hate. As punishment, I was forced to be in here and become a gladiator. Bit of a promotional disaster that one, but I'm actually organizing another revolution. I don't know if you'd be interested in something like that? Do you reckon you'd be interested?
Later, when Korg gained his freedom,
he talked about starting the revolution, but then hit into Loki who lead him to Asgard through Devil's Anus.
In the after-credit scene of the movie, we saw that
Grandmaster was overthrown by the revolution. He even declared that the uprising was good and it couldn’t have been done without him because you need someone to rise against, and that they should call the whole thing a tie. :)
When did Korg get the time to print and distribute pamphlets to start the revolution which succeeded in overthrowing the Grandmaster?