Well 'Over my head' is damn funky and catchy and they might play that. Summerland is just a great tune IMO (they might play it too). For some heaviness check out Pillow, Complain or Black the Sky or something. They are all from the heavier Dogman album.
Hope you find something you like and enjoy the show (I wish I could see them but I live in England!).
I love Gretchen and Dogman (I need to pick up Faith Hope Love and Out of the Silent Planet). Actually 'Please come home...' is growing on me now too (after like 2 years )