On Biden's most recent two trips to Columbia there was a fair amount of activity on Palmetto 800.
CPD was using their Special Events Channels, SWAT, Command, and OPS-2 mostly for motorcade traffic control and parking lot security.
Cayce Public Safety and LCSD were on LE-Call directing motorcade traffic control in their areas.
MA-10 Was in use when he spoke at USC Graduation to direct activities around Colonial Life Arena.
Columbia Fire Used Command 2 for their communications.
SCHP Was on Special OPS 1 for Motorcade Traffic Control and LE-Common 8 for coordinating arrival of the Motorcycle Units.
Richland County EMS was using their Special Ops Channel 7.
I was too far out to monitor for simplex operations and scanning the Federal Band has never produced anything for me, I'm sure all that is AES-256 or Facinator.