It’s a small instrument, but it’s made a big impact in music. The ukulele is once again showcased in all its glory at the third annual North Bay Ukulele Festival this weekend. Performers include contemporary Hawaiian music star Faith Thompson Ako, progressive psychedelic musician Sir B. Mantis, Sonoma County folk trio the Musers and several others. Expert instructors also hold workshops, vendors exhibit their ukes and the ukulele community comes together on Saturday, Oct. 20, at the Arlene Francis Center, 99 Sixth St., Santa Rosa. 2pm to 10pm. Free admission. Northbayukulelefestival.com.