Riding bikes is fun. Riding bikes at night is a whole lot of fun. Better yet with a gang, crew, or posse, exploring the dark corners of the city, ending with a raised glass. Not hard to do it your way---here is my way.
Step 1: Tap the members
Any likely bunch will do. Try to mix it up gender-wise, unlike this bunch of computer scientists.
Step 2: Gather the society
You need a place to meet. Somewhere central that everyone can find easily. Say, the flagpole in the middle of campus.
Step 3: Wait until dark
That is kind of the point of night biking, yes?
Step 4: You're going to need lights
To be safe riding at night you need to be seen (by drivers)---bring blinky lights with fresh batteries. Less crucial is being able to see, but you can bring a headlamp like intrepid Sean here, or a headlight bright enough to illuminate the road like Carsten.
Step 5: Pick a route
Somewhere without too much traffic, somewhere you don't normally go, somewhere you didn't think you could get to from here. Ideally somewhere that looks pretty at night, like downtown Pittsburgh, the Paris of Pennsylvania.
Step 6: Ride across a bridge
Step 7: Ride through a tunnel
Step 8: Have a beer
You've earned it.
Step 9: Have another beer
That other place was too crowded.
Step 10: Ride home
Don't drink too many beers or you won't be able to see! Happy night biking!