Karma's Your Gal
If it's a true GFE you are after, I would recommend Karma, who goes by Sunshine on this board. You can contact her via PM for her availability on the dates you specified. She does incalls and outcalls and is a Five Star SP.
Failing that, there is always a Canadian Beauty girl in town. Most of them do provide a GFE. You can check their website to find out which of their girls might be here on Aug 14th-16th, or even send them an e-mail.
Good Luck.