7 pm: Music

Daniel Lewis was the legendary music director of the USC Symphony for decades, until he retired in 1995. Now the Colburn School of Performing Arts, whose new building is rising next to the Museum of Contemporary Art downtown, has brought him out of retirement to lead its students in the award-winning Colburn Chamber Orchestra. His first outing with the kids tackles Teleman, Mozart and Janacek.

* Colburn Chamber Orchestra, United University Church, 817 W. 34th St. (on USC campus), Los Angeles. Free. (213) 743-2306.

10 am: Museums

New at the Ronald Reagan Presidential Library are two exhibitions, one taking a look at what presidents do to keep fit (Herbert Hoover used a 10-pound medicine ball and Calvin Coolidge used a “mechanical horse”), the other a collection of letters, Christmas cards and gifts given by and to presidents and first ladies from as early as 1823. Included are FDR’s Christmas stocking and the Kennedys’ 1963 White House Christmas card, signed but never sent.

* “Flexing the Nation’s Muscle: Presidents, Physical Fitness and Sports in the American Century” and “Season’s Greetings From the White House,” Ronald Reagan Presidential Library and Museum, 40 Presidential Drive, Simi Valley. Mondays-Sundays, 10 a.m.-5 p.m. Ends Jan. 4. $4, adults; $2, seniors; children under 15 free. (800) 410-8354.

8:15 pm: Pop Music

After 18 years with the hugely popular Mexican group Los Bukis, Marco Antonio Solis has a No. 1 Latin hit of his own, “Venia Vendita.” The singer-composer’s Universal Amphitheatre show is billed as his first solo concert appearance ever (as distinct from his performance at a Sports Arena dance concert last spring).

* Marco Antonio Solis at Universal Amphitheatre, 100 Universal City Plaza, Universal City, $28-$43. (818) 622-4440.

12:30 pm: Television

Museum of Television & Radio’s Sixth Annual International Children’s Television Festival kicks off a monthlong screening series celebrating children’s programming from around the world. Screenings begin at 12:30 p.m. with three nature-related programs: “The Sun Is a Yellow Giraffe: The Tree” (Finland), “Kratts’ Creatures: City Critters” (Canada/U.S./Germany) and “Turtle World” (Australia). At 2:30 p.m., some “heavenly tales”: “How Do You Spell God?” (U.S.), “Bobtails: The Kangaroo and the Moon” (Australia) and “Kumari: The Living Goddess” (India/Denmark).

* Sixth Annual International Children’s Television Festival, Museum of Television & Radio, 465 N. Beverly Drive, Beverly Hills. Saturday and Sunday screenings at 12:30 and 2:30 p.m. through Dec. 7, with different programming throughout. Free; suggested museum admission, $6, adults; $4, seniors and students; $3, children under 13. (310) 786-1000.

10 am: Movie Memorabilia

Many of actress-dancer Ginger Rogers’ personal mementos will be on view (including her 1940 best actress Oscar for “Kitty Foyle” and her Kennedy Center medal) and some clothing will be on sale (gowns, hats, sweaters, etc.) this weekend. Also on sale: 1942 glass milk bottles from Rogers’ dairy business in Medford, Ore.

* Ginger Rogers Special Exhibition and Memorabilia Sale, Hollywood Entertainment Museum, 7021 Hollywood Blvd. Today-Sunday, 10 a.m.-6 p.m. Adults, $7.50; senior citizens and students, $4.50; children 5-12, $4. Cost of museum admission will be deducted from the price of any Ginger Rogers items purchased. (213) 465-7900.

11 am: Movies

“The Artists Revolution,” Daniel S. Moore’s 30-minute documentary about Czechoslovakia’s “Velvet Revolution,” in which students and artists led a swift, bloodless overthrow of a Communist dictatorship, screens Saturday and Sunday. There will a brief question-and-answer session with Moore after each screening.

* “The Artists Revolution,” Sunset 5, 8000 Sunset Blvd., West Hollywood. Saturday and Sunday. (213) 848-3500.

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FREEBIE: Play reading of “Water From an Italian Pump,” Caltech’s Avery House, Pasadena, 8 p.m. (626) 395-6163.