My suggestion is to have a rival faction.
Example: Team Dogs vs Team Cats
There will be 2 sides. Each player has the option to choose a side but only once. Their team identity will be hidden from all other players. (This prevents 1 side kicking out other side's team members for advantage)
Each team accumulate points when each team members completes a sector map (less points for lower level maps), PvP, and BvB.
At the end of the season (couple of weeks or whenever Allie decides), prizes will be handed out to the team with the most points.
(May or may not do: a minor prize will given to the losing team for effort.)

The prizes will encourage to player to participate in the event and something they could strive for. It also keeps players ingame busy.

Me (Asphorus) and MedChill discussing about my idea
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Sooooooooo..... this event will keep player busy and they will be rewarded in the end.