No it really DOES NOT. Rafael23cc is in error. Class C-Restricted is explained in the Membership Manual but is omitted in the Sanction Procedures of the Rule Book.

Sanction Classification has nothing to do with the type of aircraft, just the people, and the number of events and the awards.

To avoid confusion, all sanctioned events are for AMA members only. However a sanctioned event can be restricted to certain people within the AMA. If so, and the event is competitive, then it is a Class B Competition. Example: You sponsor a competition and you restrict it to the members of a certain club, clubs, and/or an organization other than AMA. That event is Class B.
OTOH, you are an IMAA member, and you sponsor a Fly-In (IMAA events cannot be competitive) however IMAA events are restricted to IMAA members. That event is C-Restricted. No competition.
If you sponsor an event for a general Fly-In with no competition then you are Class C.

If a sanctioned event used airplanes as a restriction, then almost all events would be C-R. Pylon events are limited to Pylon Racers, each defined for a specific class. Pattern is limited to Pattern airplanes. Almost all competition events have definitions for the specific structure and power for the specific airplanes.
C-R is simply an add-on to punish IMAA for restricting their events to IMAA members. That is killing IMAA. Both the AMA EC and the IMAA Board are too arrogant and stupid to work it out differently. [:@]

The same applies to ALL AMA Competition Classification procedures. It's all absolutely archaic as the classifications stem from the old days of when FF and CL events were held together, and sometimes along with an RC event. BTDT! The AMA President, the EVP, and the Contest Board Chairmen should each and all be ashamed of their dereliction of duty for not bringing these items to the table and revise the programs. As of now Contest Coordination is basically unworkable.

Even if AMA allows one's event to slip through with a wrong classification, as the Contest Director, one should be very ashamed for not being adequately informed in his duties to know better.

Again, Frank, you're getting a lot more than you ask for. OTOH, when one aspires to do a job, then one should be willing to learn every detail in that job and prepare to perform it in detail.

Good Luck as a CD.