Since the event is held here in the US, make sure it’s a peaceful protest because it will be on private property at the Anaheim Convention Center and the Anaheim police department is always in attendance
I would assume that if you protest in the event itself, on the grounds or anywhere that isn’t public property you will be escorted out and if there is any resistance or violence while being escorted out, you will be on the way to jail
Your plan B should consist of, protest outside the event and then enjoy the gaming festivities which you paid for inside the event and do both peacefully