I logged onto an alt I don't play a whole lot and noticed I still had Call to arms: Isle of Conquest. The really interesting part is its still shareable.
I haven't tested yet to see if its repeatable in the same day or not, or if you can Do it along with the new "Call to arms weekend". But at the very least you and a friend could save the quest on alts, and keep sharing it with eachother during the week for bonus honor.