It worked for the SCCA prod group with our Prod Fest race at VIR in Novemeber, even in the beginning we got newly crowned runoffs champ to show up and race, we had a prod and GTL only field/group/race. The event flourished mostly because of the prod racing forum, and three of us working to get folks interested, Rick Starkweather got event sponsors, which provided funds for the throphies, and we had door prizes, I help set u site for Prod fest Swag and helped market it, and Mark Coffin worked his arse off, and hosted the prod fest Saturday night social. WE always had good fields, and good mixture of both national and regional racers. I think the key to the Prod Fest success was a forum where the SCCA prod community all hung out, we lack that with our vintage prod race cars, so harder to get the word out.
It seems in vintage, folks are more interested in having make/model focus events , over class type focus events, however FV and FF do have class type focus events. The MGVR, MG only focus event is great race to go to, if you race a MG. AS you all know I tried with the vintage prod fest and I think we got more entries with it, than without it, it was just more than I could take on.
On the topics of venues, how about Road Atlanta in Nov., you know like the old days. VDCA now has that date there, I jokingly suggested we call that race weekend "The Still Running Offs"