The drop down options to force the system in open and closed mode would have an option for All Hours Closed (Until next scheduled open event)
This would be nice so a system admin would only have to log into the admin portal 1 time.
On Friday the office will closed early so the admin will log in and choose "All Hours Closed (Until next scheduled open event)"
Then on Monday when they open - the system will automatically go to regular schedule timeframes without having to have the admin log back in and manually make the change.