7:30 pm: Music

Rachael Worby conducts “Music Under the Stars� outdoors at Pasadena City Hall, the opening event of the Pasadena Pops Orchestra for 2001--the rest take place at Descanso Gardens in La Canada Flintridge, starting June 29). At this free event, Worby leads the Pops Orchestra, the Occidental-Foothill Master Chorale and a brace of high school marching bands in music by, among others, Gershwin, Elton John, Lloyd Webber, John Williams and Tchaikovsky.

* Rachael Worby leads the Pasadena Pops Orchestra in “Music Under the Stars� in Centennial Square at Pasadena City Hall, 100 N. Garfield Ave., Pasadena. 7:30 p.m. (626) 792-7677. Free.

8 pm: Theater

“A Little Night Music,� Stephen Sondheim and Hugh Wheeler’s romantic, provocative musical about old love, new love and rediscovered love, is directed by and features respected stage and film veteran John Rubinstein.

* “A Little Night Music,� Interact Theatre Company, 5215 Bakman Ave., North Hollywood. Thursdays-Saturdays, 8 p.m.; Sundays, 3 p.m. Ends July 1. $25; opening night gala, $35. (818) 773-7862.

10 am: Family

Troubadour Theatre Company’s troupe members--who have performed in what’s known as the Ringling Bros.’ “Greatest Show on Earth�--opens the Big/World Fun Series at the John Anson Ford Amphitheatre with its slapstick, clowning family comedy, “Funky Punks With Junk in Their Trunks.�

* “Funky Punks With Junk in Their Trunks,� John Anson Ford Amphitheatre, 2580 Cahuenga Blvd. East, Hollywood, Saturdays at 10 a.m. Ends June 9. Adults, $4; children, free. (323) 461-3673.

7:30 pm: Movies

The UCLA Film and Television Archive presents “The Long Holiday� (De Grote Vakantie) a film made by the late Dutch director Johan van der Keuken after he was diagnosed with prostate cancer. A mixture of film and digital video, the work chronicles Van der Keuken and his wife as they travel from Amsterdam to Bhutan, Nepal, Mali, Burkina Faso, Brazil, the U.S. and back home again. The acclaimed photographer-filmmaker was known as an artist who has expanded the political and experimental possibilities of the nonfiction film.

* “The Long Holiday� (De Grote Vakantie), UCLA Film and Television Archive, Melnitz Hall, James Bridges Theater, near the intersection of Sunset Boulevard and Hilgard Avenue, Westwood. Saturday, 7:30 p.m. $5 to $7. (310) 206-FILM or www.cinema.ucla.edu.

all day: Family/Festival

The outdoor “Roots & Shoots� festival, presented by the Jane Goodall Institute’s environmental and humanitarian program for youth, will feature live animal presentations, music and dance, art exhibits, children’s craft activities, displays of student projects and local conservation groups. The centerpiece will be Dr. Goodall herself, talking about her experiences in decades of studying chimpanzees in Tanzania.

* “Roots & Shoots,� Huntington Library, Art Collections and Botanical Gardens, 1151 Oxford Road, San Marino. Saturday, 10:30 a.m. to 4:30 p.m. (Jane Goodall will speak at 2 p.m. on the lawn of the Australian Garden.) Festival activities included with museum admission: adults, $8.50; seniors, $8; students over age 18 with I.D., $6; this day only, children under age 18, free. (800) 200-5566, (626) 405-2100.

all day: Jazz

“A Great Day of Jazz� is a medley of three panel discussions examining “Jazz in Hollywood,� “Women on the Road� and “Swingin’ With the Cast of Side Man.� Participants include bassist/bandleader John Clayton, blues artist Linda Hopkins and jazz trumpeter Clora Bryant. The events are free.

* “A Great Day of Jazz,� Pasadena Playhouse, 39 S. El Molino Ave., Pasadena, 10 a.m.-2 p.m. Free. (626) 792-8672, Ext. 210.

7 pm: Performance

It takes two to tango, but it takes about nine people for Camerata Tango to explore the mystique of this Argentine dance. Pianist-composer Ana-Lia Lenchantin leads the charge with her quintet, while alumni of the show “Forever Tango� cut a rug on the floor and former Cirque-ians twist above.

* Camerata Tango, Key Club, 9039 Sunset Blvd., West Hollywood. 7 p.m. $30. (310) 274-5800.

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FREEBIE

Live mermaids, swashbuckling pirates, Samoan fire dancers and interactive environmental booths will be some of the attractions at the Sixth Annual KelpFest, on the beach in Santa Monica where Ocean Park Boulevard meets the beach. 11 a.m.-4 p.m. (310) 305-9645.