NP -- keep an eye out for communications about your 8th grader participating in the HS club's JV "Spring League." MoCo high schools have "club" teams. "Spring League" had a short season that began right after MCPS spring break:
https://monumentalhockeyhub.sportngin.com/page/show/3567860-mshl-league-information
I think sometime in mid to late January there was an announcement in his middle school's newsletter how rising 9th graders could contact their high school club team about spring league and about the high school teams generally. We also found the contact information for the club team manager and emailed directly about our 8th grader's interest.