First of all, i would love to come up and play the course. I live in Orange County and play in LA, Orange, and San Diego counties. Most of the courses that I play have a stand alone website, or a Facebook site to promote themselves. A nice invite to those clubs to come up and play might be a good first step. If the directors of these clubs are open to it, you might be able to send flyers to them that they can pass out at their weekly and monthly tournaments. Even Better would be that they would allow you to come to there course and pass the flyers out in person. (Bring Photos of the course to show off)
On your website you refer to the course as being for Frisbee golf. It might be better to refer to it as a disc golf course, attracts a more serious player. If you have any photos of the course, and a map laying out the holes, that would be could to put up on the site as well.
The photos, map, and hole distances can also be loaded up on this site: http://www.dgcoursereview.com/
Many people search for courses to play on this and PDGA.Com website. Your tournament info can also be loaded on these sites.
I am a theatrical producer and do a lot of promotion, but must admit, the event is coming quick, and getting newspaper coverage down in LA and OC might take an angle.
Send me a message link and I'll try and work out an angle inthe meantime.