good question, Jay.
Equity requires a closing notice being posted 1 week before. However, they can still close but must pay the actors for the week. The producers may have put a closing notice on the board last week. They have the option to remove it.
If a show closes opening night the insurance money can kick in and protect the investment.
All of these rules might be different these days...I'm a little out of the loop...but that's the way it used to be.
I hope someone who knows more than I will add and/or correct my post! I may be COMPLETELY wrong about this nowadays.
"It's not so much do what you like, as it is that you like what you do." SS
"Time flies like an arrow, fruit flies like a banana." GMarx