They are several (at least 8 or 9) parking garages or parking lots that are around the Front St area. I saw a concert at The Basement last night and was able to park right behind Nationwide Arena. I expect these lots to be full of Red, White, and BOOM go-ers but it is within walking distance of the Newport. The distance is only a few blocks (10 at the most).
Once again to all that is going, plan to arrive very early. The earlier you arrive, the better parking and spot in line that you can get.
Also, the show is in 3 days!