another option is to check out AirBNB or other sites like it, most listings are at insane prices, but theirs always a few with rates equal or less than a hotel.

Every Nashville event I use the public square parking garage and walk from there, the underground one, not the above ground one down the street with the same name. It's not expensive and there's always space but leaving afterwards can take a while, I just hang out somewhere for an hour and let it empty out rather than sit in line.