Broadway Critics - A Question

Hey, all!

Quick question: When is it likely that Broadway theatre critics attend performances? I know that it's not like decades ago when they'd "make the deadline" to be printed. Just curious as to when exactly a show would be "critic-ready" and considered "frozen" before opening.

usually 4-5 performances.

In the last week of previews, there are normally a few nights that are "press nights"... often filled with critics and friends/family of the producers to pad the audience with people who will clap/laugh/react, etc.