I found a couple of centuries that might be fun to do:
1) Windmill Century Ride - Tailwinds Bicycle Club, Santa Maria, CA - July 18, 2015
"Full Century ~ 102 miles (Elevation +5277 ft).
This loop heads out towards the hills of Casmalia, and climbs, passing Vandenberg AFB. You'll travel the back roads of Lompoc and head to the authentic Danish village of Solvang where you'll stop for a nourishing lunch. Then it's on through the picturesque roads of Ballard and Santa Ynez. You'll enjoy the winding country roads and the rolling hills along the Foxen Canyon Wine Trail, head back through the tiny towns of Sisquoc and Garey and through Orcutt where you'll complete your journey and enjoy a Santa Maria Style BBQ at Pioneer Park. "
http://www.tailwindsofsantamariabc.org/century.html
2) Tehachapi GranFondo - 100.3 miles +7249 feet - Sept 19, 2015
"A true GranFondo, this 100 mile ride will take participants up past the world famous Tehachapi Loop, through the rolling golden foothills, and into the forest heights. Finally ride along the towering wind turbines of eastern slope and back into town."
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http://www.tehachapigranfondo.com/