The California Roots Music & Arts Festival — known universally as Cali Roots — is the celebrated four-day music festival that has been animating the Monterey County Fairgrounds for more than a decade. This year’s Cali Roots opens Thursday, with more than 60 acts on four stages, including such headliners as Wu-Tang Clan, Rebelution, and Michael Franti & Spearhead. And for the first time, one of those acts is Soulwise, the popular Santa Cruz combo famed for their feel-good, danceable, groove-oriented West Coast reggae sound.