You leave before the encore so you can beat the crowds.
You know when the encore is coming. The crowd is cheering and everyone is buzzing about what song the artist is going to play. But you? You're quietly slipping through the crowd to the door because there's no way in HELL you're getting stuck trying to leave at the same time as everybody else. It doesn't matter if they resurrected Tupac and the Dali Lama is making an appearance and they're also handing out Hot Pockets to everyone, you are not waiting to the end of that encore to leave. Because you're old enough now to know that your sanity is more valuable than anything. Even Hot Pockets.