John, great to hear from you man, I was going to email you to come check out the site. I think details are still forthcoming but basically there are stuff that's happening on the 12th around Temecula and then on the morning of the 13th we're meeting at Calfornia Bagels (address in a post above). However, the route to Julian is basically this...
California Bagels to 15S, Temecula Parkway towards Pechanga, Rainbow to Lilac to Valley Center to Harrah Rincon, then up South Grade and down East Grade back to the 76, then onto Mesa Grande before we come back to the 78/79 to head into Julian.
For you, from Oceanside, it's 78E to 15N and then Rancho California exit to get to California Bagels.