I was there a couple of weeks ago on the Saturday night of the Macklemore concert. It was easy to find a parade spot 10-15 before. I was near the beginning of the parade route, in front of the Horror Makeup Show. After the parade passed me I headed toward the concert area, where signs on the video screens said the area immediately in front of the stage was full. So I got a spot just across from the screen, which was fine, but the bass was so loud I couldn't hear anything he was singing, so I left after 3 songs.
During the following weeknights you could have gotten a spot for the parade 30 seconds before, it was so deserted.