August 21 the park closes at 9pm (so Spectro would have to start at 8pm in order to run it). This is getting back into the slower season where Spectros are limited. I know that stinks when it is the week you had planned but Spectros for August are:
August 1-3 -- 9pm & 11pm
August 4-14, 16, 17 -- 9pm
August 24, 28, 31 -- 8:30pm
so there are no Spectros scheduled for the 15, 18, 19, 20, 21, 22, 23, 25, 26, 27, 29, 30 (which are all park closing of 8:30 or 9pm) you will still have Wishes though, not that that makes up for Spectro...