Thurs., July 11, California WorldFest

Nevada County Fairgrounds, 5 p.m., $15-$170

This four-day world-music festival kicks off at 5 p.m. on Thursday with an opening ceremony. And then, in the following days, more than two-dozen artists will play seven different stages at the Nevada County Fairgrounds. Thursday's headliner is Yemen Blues, a unique jazz-folk-fusion project led by Yemeni-Israeli musician and singer Ravid Kahalani (pictured; the group also has another performance scheduled for 11:30 a.m. on Friday). Other highlights of the four-day event include touring artists Delhi 2 Dublin, Pink Martini and Vieux Farka Touré, plus locals Alasdair Fraser, Mamajowali, and Rita Hosking and Cousin Jack. 11228 McCourtney Road in Grass Valley,