Not voting yet, but your picking a day/time at least about a month away would help people decide.

Start hitting car websites and inviting them to come out. Post a 50/50 drawing. Get some sponsored merchandise to give away and be sure to mention the sponsors name/location. Go to other meets and pass out flyers. Read the other postings from local events to see what other people did already, and what you should do.

Evenings are cooler than a 6-hour heat-of-the-day meet.

Get a pkg of dogs and a pkg of burgers to start. No big investment.....
If people show, run to the store. If low turnout, eat 'em yourself........

Having the kids do Karate demos might be some entertainment.
....and if you get creative, you can think of other things....-Bob

-------------------------------------------
You won't buy the bus on the first meet. It will take some work.
But aren't you in business anyway?