The level blueprint can look for and cast to all actors of a specific class or parent class in a level, if you link the pause event in the player class to a custom event you can call that event from the level blueprint, by using this and aplying it client side you could possibly mass pause the clients that are inside that map, however please take this suggestion with a grain of salt as I both cannot check my idea nor can I implement it since at the moment as im still wrapping my head around networking at all