Let's try to keep "Zone 8 Competitive Driving Events" separate from Tours. This discussion is really about AX/DE/TT events, which are Competitive Driving Events and have very different insurance and other rules about who can participate. The back-country drives with the vets held in the past years have been "Tours" - not competitive driving events (even if there were a few people who thought otherwise...

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First - caveat - I am no longer the Treasurer, and the following rates may have changed...
Zone 8 charges a flat fee of $6 per Participant when we host a Zone 8 event. It doesn't matter whether the Participant is an instructor, driver, or Taste of Track rider - if they are registered as a Participant (per National rules), they would be subject to the Zone 8 fee. If we do TotT at both Region and Zone 8 events, we would either need to charge a Zone 8 surcharge, or make the base fee high enough to cover both types.
Insurance: There is no per-event insurance requirement for AX events - these are covered under PCA National's "blanket" coverage for all the Clubs. DE and TT events have different insurance premiums based on the number of Participants.
1-49 Participants = $300
50-99 Participants = $450
100+ Participants = $600
In the worst case, if you had 99 drivers at a DE and added one TotT rider, that additional rider would cost PCA/SDR $150 in additional insurance premiums.
The Zone 8 rules are very clear as to what is allowed in the Track Tour and Taste of the Track programs. However (as I stated in my first post here), the Taste of the Track program is really targeted towards allowing someone to experience a full day attendance and participation in a DE/TT event, except for actually driving their car.
If you read the SDR "Standing Rules", there are no real exceptions to the Zone 8/National regulations in this area. HOWEVER, I would think that we *could* entertain a change to the Standing Rules to specifically address a modified "taste of the AX track".
Also, with advance notice, the Board does have the ability to waive some requirements on a per-event basis, although waiving requirements that are tied to insurance coverage stipulations can be very risky. If there were a compelling reason to allow certain qualified individuals to participate in a limited ride-along at an event (e.g., military service members at Coronado), the Board can allow the Event Chairs to make some exceptions.
Personally, I think the spirit of the Taste of the Track program should always be maintained - this is intended for those people who are considering becoming full-fledged competitive event drivers and want to see what is involved. Taste of the Track should NOT become a means of selling rides to make money, or just impressing your friends and neighbors with "thrill rides".