You heard right, free Goat Format tournaments, and the winner gets a DuelingBook donation code. See this thread for the first one:
You can get notifications about future tournaments using the #tournaments channel of our Discord server. Do you know of any other Goat Format tournaments happening online? Let us know in the comments, and we'll be happy to advertize them for you.
Upcoming Live Events (Goat Grand Prix)
Tournament Coverage/Deck Lists
Goat Grand Prix Application
Hall of Fame