Just made reservation for Sat. night 6:00 @ Sunnyside Restaurant.
http://www.sunnysiderestaurant.com/

As far as Fri. at T.G.I.F, I just called they said they do not take reservations, but can call ahead.
The address and phone number is, 5470 Carlisle Pike Mechanicsburg, PA 17050. (717) 766-1851
For those of you who would like to put it into their GPS...