I am not a coach or a lawyer, but I just read through the CIF 600 series bylaws and noticed a few interesting things:
1. Competing as an unattached athlete in track and field is allowed according to Bylaw 600.G.2
"Unattached competition is permissible for a student in other than school contests during the season of sport provided the student enters in the individual sports of badminton (singles and doubles), beach
volleyball (pairs), cross country, golf, gymnastics, skiing, swimming and diving (including unattached entry on relays), tennis (singles and doubles), track and field (including unattached entry on relays) and wrestling."
2. Bylaw 215 specifically prohibits athletes from participating in intercollegiate meets
"Q: What is defined as a collegiate track meet and/or intercollegiate competition?
A: A collegiate track meet and/or intercollegiate competition is one in which collegiate athletes are competing for or
representing their school."
3. I believe The TEN is considered a "joint sanctioned event" as collegiate athletes will be competing while representing their respective colleges. Joint sanctioned meets are allowed if and only if the athlete participates solely in races exclusively for high school athletes. Open races at joint sanctioned events are prohibited.
4. Bylaw 600 lists the penalty for the first infraction as being required to sit out for the next two CIF sanctioned meets the athlete's school team participates in.
5. The second infraction results in immediate ineligibility for the next 365 days in ALL sports
6. Road races are specifically allowed for multiple reasons, simplest being that "road racing" is not a CIF sanctioned sport
Sources:
https://www.cifstate.org/governance/constitution/600_Series.pdf
https://www.cifstate.org/governance/constitution/200_Series.pdf