Thank You Yaz for bringing this up.
I think the proper soccer send off would be a tifo project. Doesn't need to be overdone, but a simple thank you on blue & gold would be enough. Balloons would be ridiculous, and I think it would be best this Saturday, but with the short time period. I'd say either the MAC championship or Game 1 of the NCAA College Cup run. I've always said I'd help if someone organized a tifo project, at this time I'm in no position to organize with my current schedule. Paint, cloth, and space.
You could make a bar scarf out of blue and gold bed sheets sewn together with text painted on top. Or one large blue sheet, painted in gold. Keep it simple.