Yes mixed events promoted as such have equalizers when teams of different classifications play.
However, at least in California, if you play an open tournament the rules are the same every game regardless of classification. Thus if a C team plays an E team it is the same rules as if playing another C team.
Conference is OPEN thus meaning any team of any classification can enter and play by the same rules. This is known in advance to all teams.
The same also holds true at all World Tournaments. If a C team enters B Worlds, there is no special accommodations for the C team.