Some feedback on my original question, guest are allowed at the M. O. Campbell Education Center. The oath ceremony was yesterday, 1,259 people took the oath and there was a good turn out of friends and family.
We were there around 7, the line moved relatively quickly. Please note there are two sides of the building (east & west) to enter so take note of that on the application so you stand in the correct line. They wrapped up the ceremony around 9:30, visitors were asked to exit, and then around 10 my wife finished the check out process.
The overall process was well organized.