This is going to be really hard to do, but im just going to throw the idea out there - as it has many varieties/possibilities.
SKY BRIDGING -
Basically a rainbow-like-shaped bridge, made out of galaxies. (See how far we can get, hopefully to the warpgate)
Or a "Ramp" A series of galaxy transports placed in a way that say an ATV can drive up and fly off at the end from a high height. (this is probably only safer to do at warpgate as their is no teamkill effect, effectively allowing us to get an ATV ontop of a galaxy or any other vehicle. Them creating the ramp into the sky from the WG.
Or a Frogger event, the biggest game of frogger ever! (the old game where a frog tries to cross the road) But with lightnings and prowlers, and sunderers moving back and forth with a team trying to cross.
Space invaders! - (Imagine looking at say, alot of galaxies front-on and then imagine them as space invaders.) Get each one to down to like - almost no health and then add in some editing and so forth later on and the you have Space invaders!
Sunderer-train, a back-to-back train, a BRTD guy once said "there is no brakes on the rape train".
Mass-lib bomb the crap out of a warpgate.
A hold-out event, will need ALOT of people. Basically - head to a Base where VS/NC are fighting it out - but we turn up, miles from our own lines. And we show them who is boss.
Melee tournament - a knife only fight, like the days of ps1.
Try and spell out BRTD in spawn beacons. (Have someone drop down from orbit to take a picture.) Or with vehicles - a huge sign.
Just a few ideas/concepts to get people thinking!