Prince George isn’t the only Royal with a milestone birthday this season—Prince Harry turns the big 3-0 on September 15 and the planning is already underway for this event.

Vanity Fair reports that Prince William and Duchess Kate are handling the preparations for Harry’s birthday, which will include a dinner party for 30 friends at the palace.

Harry’s mate, nightclub owner Guy Pelly, has apparently offered to throw a party at hot spot Tonteria on his actual birthday (the Monday), but the Prince would have to leave early at around 10:30pm.

“Harry would like to go, but he knows he can’t have a crazy night out and misbehave. For him, September is all about the Invictus Games and he doesn’t want anything overshadowing that,” a source told the magazine.

The games are being held in London and complete a day before his birthday.