Just getting down to the Mariposa region is already a 6 day roundtrip for us, so any thoughts to participate are really of the Bucketlist class.

Still, in that east central region of Cali, there does look to be many twisty bits to sample:
My friend, there is sooooo much great riding in CA not just the east central region! There are the Sierra passes (108, 4, 120, 49 section called The Little Dragon) which you could easily hit during the YFO gathering. Lots of other really fun roads in the area as well. Then there's NorCal which includes gems like 36, 299, 3, Gazelle-Callahan Rd, not to mention all the fun in the Sierras like 49, Bucks Lake Rd, Quincy-LaPorte Rd, 70 aka Feather River Canyon, etc... and I'll bet, dependent upon his schedule, Doug/bugnatr would guide you around his hood. And then of course, the famed PCH/Hwy 1... tons of other stuff in SoCal too... just depends on how much time you've got to spend, what you want to see, and where you want to go!
