Looking to get my girlfriend up there for Sunday night. Was looking around for a single Sunday ticket but all I see on stub hub (was simply looking there for references) were VIP tickets which are the same price as full GA wristband so are there any single day GA tickets?
That's actually not true. The Gorge has season ticket holders that receive single day tickets. A lot of them sell them on after-market sites like Stubhub. Like 4-day passes, I recommend watching them for the next week or so to see if prices drop.