Keep Butcher's Bridge after the event, merge it with ARAM queue, 50% to play on it or Howling Abyss
There. Now we don't need to have entirely new queues for the same exact game mode just because there's a different map.
It's just a skin, isn't it?
When you queue for ARAM, make the map skin chance based. 50% chance for HA and 50% chance for BB.
This gives more incentive to work on the maps, since they will be permanent rather than temporary, and allow us to enjoy content for a longer period of time instead of this temporary "put our game on life support" design that Riot seems to enjoy (game modes, and now map skins.)