The Smart Park on SW 10th abt 3 blocks south of the theater is probably the cheapest & most reliable option. Just don't head north into the ultra-congested Pearl District. It's OK for pedestrians, dire for cars.
If it's late drive around the block for a space on the street. The Public Garage a few blocks is a good bet. If cost is no option there is a surface lot across the street.
There's a nice little parking lot right across the street from the venue.
There is usually a spot around the food carts, because people come and go often from there. I usually get lucky and find a spot on 10th
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