Happening Friday

MUSIC

Katy Perry To judge Perry as inauthentic or unoriginal would be wrong; as with a great ad campaign, familiarity is her greatest achievement. She can feign a rocker’s stance on the Alanis-inspired “Circle the Drain” or a hip-hop diva’s stutter on the Rihanna-influenced “E.T.” and convince you it fits her perfectly. Nokia Theatre, 777 Chick Hearn Court, L.A. 8 p.m. Friday through Sunday. $34.50-$49.50. nokiatheatrelalive.com

FOOD

Taste in San Pedro More than 30 restaurants, bars and venues will take part in the showcase for local cuisine and night life in the South Bay enclave. Concerts featuring Poncho Sanchez and Fan Halen round out the weekend. Harbor Boulevard Promenade and Berth 87, Port of Los Angeles. 6-10 p.m. Friday, noon-9 p.m. Saturday, noon-7 p.m. Sunday. Free. Tasteinsanpedro.com.

Mammoth Festival of Beers and Bluesapalooza Mammoth is usually known for its excellent skiing, but for this it turns its focus to another frosty attraction. More than 50 microbrewers team up to pull taps in pristine environs, with accompanying concerts featuring Blues Traveler, Dumpstaphunk, Robert Cray and more. Mammoth Lakes Resort, Mammoth. Friday through Sunday. $30-$49. Mammothbluesbrewsfest.com.

EVENTS

Rethink/LA Los Angeles was built as a city of the future, and in a time of flux it has again become a flash point for societal change. This series examines the environmental, social and cultural issues facing the city as it plans a new vision for its infrastructure. A+D Museum, 6032 Wilshire Blvd., L.A. Through Sept. 4. $10. Aplusd.org.