I'm going to be staying in Portland from May 31 to June 2, and we're staying in an AirBNB, as we always do, so I'll also be figuring out charging a little bit while we're there. Fortunately, Plugshare does show a LOT of the parking garages in the downtown area have car charging stations in them. Make sure to check on Plugshare what brand of network they are in and get the necessary accounts/cards set up beforehand. It seems to be mostly Blink, with some Semacharge and OpConnect. Some may be able to use Pay with Plugshare through the mobile app without having an account or card, but maybe not.
I would only need to take my car downtown and let it charge one day probably, and we could bus to/from downtown on another day. My other charging opportunity is not near downtown, but there is a Fred Meyer with charging across the street from the Hawthorne theater where we are seeing a concert.