Do a level 1 battleground of sorts where a staff member summons a bunch of level 1s on horde and alli to a BG where first side to like 50 kills or something wins, then award the
- person with most kills (losing or winning side) maybe a mount or something since there would be 20-80 people going for it
- team that wins they all get something minor like gold or perhaps an heirloom of choice
- and person with best k/d (since they helped their team the most) - give them a mount or maybe epic item of choice under ilvl 400 for cata, (I don't play other xpacs so don't know how that would equate)
you could call it "level 1 team death-match"
to ensure no one team is over powered you could
limit items (like no furbolg pouch, maybe no heirlooms, idk)
ban any unfair buffs (unfair decided by person running the event)
lock everyone's level so they don't get xp from kills and gain an unfair stat advantage
those are optional rules though, maybe you want a full BoA hunter with 97 resist mark of the wild and 460 stamina runescroll running around