Last day the market is open before end of the Shemitah cycle on Sunday 9/13 is Friday 9/11.

There is already a pattern, independent of this, that during bubbles like the one we are currently in, there is a Friday selloff to lock in profits and a buyback on Monday. Couple that with 9/11 fears, and we are looking at a very strong chance of a crash on 9/11.