Pop vocal group En Vogue, county singer Clay Walker and rock bands 38 Special and Smash Mouth will perform at the Sonoma-Marin Fair in Petaluma, set for June 20-24.

En Vogue, whose hit singles include “Hold On” from 1990 and “Don’t Let Go” from 1996, will make its first appearance at the fair on opening night, June 20. The current lineup includes Rhona Bennett and founding members Cindy Herron-Braggs and Terry Ellis. Their new album, “Electric Cafe,” featuring the single “Rocket,” is due out in April.

Clay Walker, who scored six top singles, including “What’s It to You” from 1993 and “Live Until I Die” from 1994, will perform June 21 at the fair, followed by 38 Special on June 22 and Smash Mouth on June 23.

Walker has participated in several charity campaigns to help raise awareness of Multiple Sclerosis following his diagnosis in 1996, including his own nonprofit, Band Against MS, which he founded in 2003.

The fair’s concert series closes June 24 with Fiesta Latina, featuring Grupo Los Sagitarios, Hechiceros Band, Banda La Congora and Creativos De Tierra Caliente.

All of the concerts, and unlimited carnival rides, are included in the price of admission to the fair, which is $18 for adults, $12 for ages under 12 and 65 and older at the gate. The pre-fair online discount price is $15 for adults, $10 for ages under 12 and 65 and older. Sprint car racing tickets cost $10 each.

This year’s Sonoma-Marin Fair theme is “Beyond the Milky Way.” The fair also includes the annual World’s Ugliest Dog Contest on June 23.