No, Chris Christie has nothing to do with it.
That is to say, it's not the GW Bridge, but it is a bridge being blocked off from traffic, a common and happy experience as it so happens.
Hint--You may be able to glimpse a roller coaster under the bridge as fireworks explode overhead.
Another Hint--As fun as the rides might be, a bike ride over the bridge is quite a thrill in itself, not recommended for those with fear of heights (I have no such fear). Plus you get to look down on all those coasters coasting.
First one with the correct answer wins a spot in the greeting line when Chris Christie arrives back in NH...whoops...that's more like a booby prize.
Another hint--I'm writing this at midnight from an outdoor cafe within walking distance of the bridge.
Tomorrow night's fireworks are from the U.S. with a scary music theme. Hmmm...maybe I'll try them; that would involve a walk to the top of the bridge.
Final hint--it's named for an explorer. Not Samuel de Champlain--his bridge is actually on the other end of the city. Oh, all right...here he is.