Hail Mary.... Sorry, but your gear is not going to do the job. ISO 3200 is not going to cut it. Shooting buildings at night using a slow shutter speed is not like shooting an action sport. You're going to need a minimum of 1/400th and even then you'll get plenty of motion blur in the limbs. You can try some artistic slow-shutter stuff, but you can't do them all like that. The 50mm 1.8 will get you shutter speed, but you're only going to be able to shoot sideline action with that FL. I've got no good news for you. Perhaps you should have declined.