Allow a playlist to be 'always on top'

For our outdoor digital marquee, I need a way to have a playlist 'override' any other playlist. I have a playlist running from 11pm to 6am, and I need that to run each night, even if i have media that would play Monday thru Friday. Yes, its easy to drag the new playlist under the 11pm-6pm scheduleor schedule an item to run 6a-11p, but I know I'll forget, and any one else using the system may not do it.