Familiar

In the far corner of the universe, a large part of the space was locked in a manner that no one could enter or leave on their own or not even the attacks could leave that space.

 It was so big that hundreds and thousands of planets could be placed inside it with sufficient spacing, this was the place where the largest tournament was about to take place.

Every single person in the universe even if it was a kid had received an invitation and whether they wanted or not they would all be teleported to that particular space to either spectate or participate in the tournament.

The powerful beings from each universe who most likely will be participating in the large war will be appearing in their respective places before the spectators.