I am not going to give you a date...I don't know what that date would be...
But, in truth, even though schools start to fill up, you never really know what might happen. Weird things do occur. Last year my dentist's cousin was on a waitlist for months and then suddenly got called to enter the class of 2009 for UOP a month before school started. I think he interviewed pretty late out there.
people change their minds...schools suddenly have spots...**** happens...I wouldn't count myself out