MD schedules are notoriously hard to find. I typically peice Northern's together using the WV board and WVSSAC site. lol.
I did see on the MPSSAA Open Date exchange that Clear Spring has 5 open dates for next year, including MD week 3 when the Northern game has been typically played the past few years, so not sure if Northern/Clear Spring aren't playing next year or if they moved to a different week.