Sentence:  After a load of photos and what-not, we descend the world's longest escalator, which are called that even as they de-escalate, and in we go to the main forum, a high ceilinged hall, full of circular cloth-draped, numbered tables, a stage at the front, the letters GQ, 12-foot high in neon at the back; this aside, though, neon forever the moniker of trash, this is a posh do, in an opera house full of folk in <WSD>tuxes</WSD>. 
Meaning of the word marked with <WSD> tags:  A tuxedo.