Back in the day we were a major Samsung Dealer. Samsung had ring time override (RTO) buttons and ring plan override (RPO).
RTO would keep the system stuck in a certain mode until manually turned off.
RPO would manually keep the system stuck in a mode only until the next event. For example, the office closed early at 3pm but wants the system to go back to regular schedule tomorrow morning at 8 am when they reopen.
In the schedule part of the admin portal I think it would be helpful for system administrators to have an option for 'All Hours Closed (Until next scheduled Open Event)'
That way they only need to log in 1 time to close early instead of having to remember to log back in the put the system back in open mode the next morning.