I just corresponded with Johnson Space Center ARC W5RRR on Twitter. They are going to try and contact Nevada Space and Science Center. The center will be using callsign K7RC. It's only 5 degrees for them but they will be demoing to boy scouts and other guests.

JSC will also be on the air as a part of NASA On The Air:

https://nasaontheair.wordpress.com/

73, John Brier KG4AKV