There is always the option of trying to include a daemon in the emulator (might be there already for all I know) that would allow events to be queued up. When the appointed hour came nigh, the daemon could spawn an event thread and hand it the event ID so it could deal with the event details.
For this "normal during day, undead at night", at 0 hour you could wipe the zone of "normals", then do a repop of the undead (making critters warp all over the place at they repop at designated points).
Or the thread could find each appropriate mob and swap it out at their current location, in their current state (kinda like the moonlight in Pirates of the Caribbean) according to the event rules.
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