Is it a big party where everyone on the planet is in on it?
Making everyone a pirate?
A party on the moon?
Everyone has so many theories but never seen anything concrete.
Delivering binks sake?
Having a giant sleepover where everyone tells their dream? (Since apparently the one piece is a giant pillow)
Post Wano he tells the crew his “true dream” that he told Ace and Sabo when they were kids. We don’t see what he says but the crew reacts in shock: here’s the panel