I'm sure the rush for the radio changeover is because one of their annual HUGE events is taking place in a few weeks, the
FIS Ski World Cup Tour on Fri 11/25 through Sun 11/27. This event has famous skiing athletes & various worldwide celebrities. This event had 30,000 spectators each day plus the athletes, team coaches, and additional event staff.
I, personally, was the internal Incident Command System (ICS) Incident Commander (IC) {two-way radio dispatcher} for the event & public safety staff, and also the two-way radio vendor and the on-site two-way radio technician as well for every radio system, except the Feds.
In past years, the event staff used a combination of VHF & UHF rental hand-held portable radios (which included 200 from my VHF rental supply) and the (UHF set of 200 were from the Killington Ski Club), 400 rental radios in use at once, daily. I dispatched out of a secure room inside the Killington Ski Club using VHF & UHF mobiles with base antennas set up out back, had 5 Uniden scanners going monitoring law enforcement, Feds, security staff {Green Mountain Concert Services}, event vendor radios, and internally dispatched Regional Ambulance Service medical staff to calls. The Killington Dispatcher only monitored the old former Ch1 Ski Patrol and I dispatched the remaining Killington repeater channels.
Law enforcement used my rental radio system atop Killington on VHF which was MotoTRBO encrypted, as the 1st year of this new event, criminals were able to monitor VT SP using UHF analog simplex, so the following years I switched them over to my VHF encrypted repeater channels.
I can post the past commonly used frequencies in a new thread, for those that want to publicly monitor the upcoming venue.
I'm sure Killington is needing UHF radio system capacity for this event, is my best guess !
If you want additional event details or frequencies, private message me.