There will be a huge car show event in West Bend, WI July 3,4. The sponsor is Pontiac Midwest Connection, formed by Chris Powers,
While this is not an exclusively Pontiac car show, there will be a separate area designated for Pontiacs. Note that there will be multiple bands for music, personalities from Motor Trend TV, a swap area, and much more. Show hours are 10 am to 11:45 pm each day.
Look at the website for details.
https://www.themotormania.com/