In the past they have offered last minute "discounts" to fill in open dates for Wishes, but I have never seen them offer discounts on Escape. And the last minute discounts were lowered minimums, it wasnt that big of a discount.
It used to say something on the website about discounts being offered for last minute weddings, but since they updated the site, I dont even think that is there anymore. I had called once to ask about it and was told they were not offering any at the moment.
Never say never, it can't hurt to ask if you want to do a last minute thing. But have a back up plan!