My installation looks like this:
In my bus-system there is a switch (I call it Party-Mode). On the Core I have a shell-script running (deamon) that checks two things every minute. First it checks the time. If it is not 10:00pm the script will exit. If it is 10:00pm or later it also checks the "Party-Mode" switch. If the "Party-Mode" switch ist pressed the script exits doing nothing. If the "Party-Mode" is turned off, the script starts to do a fiew things - e.g. turn off all audio components (bus-system), turn off all lights (bus-system), shutdown the Eken WebOrbiter, shutdown all MD's... May be it is possible to execute a LinuxMCE scenario (I do not know this).
If you create a driver for this installation bus in LMCE, all this (and more) could easily be set up using different events and scenarios.