8 pm: Pop Music

Local rock fans have enjoyed the work of DJ Swamp when he manned the two turntables in Beck’s band. Now the musician is on his own with a new album, “Never Is Now.” He teams at the Roxy with the acclaimed rap act the Arsonists.* DJ Swamp, with the Arsonists, Homestyle and Super Dank Bros., the Roxy, 9009 Sunset Blvd., West Hollywood, 8 p.m. $13.50. (310) 278-9457.

3 pm: Leisure

More than 175 works of fine art, photography and sculpture depicting images of companion animals will be auctioned to raise money for PAWS/LA, a nonprofit dedicated to enriching the lives of people with life-threatening illnesses by helping them keep and care for their pets. Actress Brooke Shields, philanthropist David Bohnett and photographer Greg Gorman will host Pet Art 3--An Auction of Art & Photography and a reception.* Pet Art 3--An Auction of Art & Photography, Park Plaza Hotel, 607 S. Park View St., L.A., 3 p.m. $40. (323) 876-7297, Ext. 113.

8 pm: Music

Cellist Allison Eldredge plays Shostakovich’s First Concerto at the season-opening concert by Chamber Orchestra of the South Bay. Music director Frances Steiner conducts a program also offering Rossini’s “Promise of Marriage” Overture and Mozart’s popular Symphony No. 40 in G minor.

* Chamber Orchestra of the South Bay, Norris Theatre, Crossfield Drive at Indian Peak Road, Rolling Hills Estates, 8 p.m. $29. (310) 544-0403.

12:30 pm: Pop Music

Rowdy veteran Travis Tritt headlines the annual KZLA Country Bash, but the day is dominated by newer names from Nashville, most notably Brad Paisley and Chely Wright, whose new album debuted at No. 4 on the country chart. Lila McCann, Ty Herndon, Rascal Flatts and others round out the bill. * KZLA Country Bash, Verizon Wireless Amphitheater, 8808 Irvine Center Drive, Irvine, 12:30 p.m. $27 to $72. (949) 855-8096.

Freebie

* The 15th annual East West Orchid Show, featuring thousands of orchids from around the world plus workshops, demonstrations and competitions, will take place at the New Otani Hotel and Garden, 120 S. Los Angeles St., L.A., Friday, noon to 6 p.m.; Saturday and Sunday, 10 a.m. to 5 p.m. (213) 485-1177.