This could be a new "Queens bounty" or "Iron Banner" type event. For one week, the crucible's defenses collapse and you have to go through each pvp map in a fire team or solo and clear out a hoard of enemies and one boss (reskinned larger enemy). Each map you clear out, you unlock to play in pvp again. Could be rewards from the crucible handler for clearing all/certain number of maps.
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Interesting idea. I think using the larger maps and having enemies hordes spawn mid match would be fun.