Are you sure? From the Wisco HS Assoc Website (Middleton is from Wisco, right?)
NIKE TEAM NATIONALS AND OTHER POST-SEASON TEAM COMPETITIONS
NXN is a post-season competition that involves a regional qualifying round. The WIAA does not allow high school teams to participate in these meets but, does allow “club teams” to participate.
CLARIFICATION:
*No contact with the high school cross country coach is allowed after the date of the State Cross Country Meet. *The team must be a club team. No high school uniforms, warm-ups, transportation, or funding is allowed. The team should not be identified as the high school team. For example; “Central High School” is not acceptable but “Cheetahs Running Team” would be.