Travis,
So if a team has a possible 6 duals from Jan 13th up to regionals does an athlete have to particpate in 4 of those duals in order to qualify for regionals/state. The certification rule deals with weight - the participation rule deals with the number of competitions. I think.
Rule 30
Art. 2: A student who is enrolled at the start of a season (or half season) of sport, must be a member of the squad for the majority (over half) of the scheduled varsity contests, in order to be eligible for post-season competition