7pm / Opera
The Bel Canto Opera, with a cast headed by Marya Basaraba, Adrien Raynier, Carlo Mancini and Zenon Kesik, will perform Verdi's "Aida" out-of-doors at the John Anson Ford Amphitheatre. Kay Otani conducts and Bill di Donato is stage director.
* "Aida," John Anson Ford Amphitheatre, off the 101 Freeway, north of the Hollywood Bowl. $35. (213) 461-3673.
9pm / Pop Music
Meshell Ndegeocello's two funk-rooted albums, 1994's "Plantation Lullabies" and 1996's "Peace Beyond Passion," have been hailed by critics and earned her a solid following. Still at work on her third album, the singer-songwriter-bassist plays an intimate show at the Viper Room as she prepares for a short stint on the Lilith Fair tour.
* Meshell Ndegeocello at the Viper Room, 8852 Sunset Blvd., West Hollywood. $22.50. (310) 358-1880.
9am / Art
Timeless, late-career paintings from Impressionist painter Claude Monet will be on display in "Monet: Paintings of Giverny From the Musee Marmottan," opening this weekend at the San Diego Museum of Art. The show will feature 22 paintings from the collection of the Musee Marmottan as well as 11 caricatures from the artist's early career, photos of Giverny by Elizabeth Murray, earlier paintings by Monet and Impressionist works by Americans who studied in Giverny.
* "Monet: Paintings of Giverny From the Musee Marmottan," San Diego Museum of Art, 1450 El Prado, Balboa Park, San Diego. Through Aug. 30. Museum hours: Sunday-Thursday, 9 a.m.-6 p.m.; Friday and Saturday, 9 a.m.-9 p.m. Admission: Adults, $15; seniors, $13; young adults 18-24, $7.50; students 6-17, $5; children 5 and younger, free. (619) 232-7931. Tickets are available at the museum box office or can be purchased in advance through Ticketmaster.
4pm / Music
Directed by Robert Fowells, the ensemble Chapel of Charlemagne presents selections of Gregorian chant, including the "De beata Vergine" Mass, with organ interludes by Frescobaldi, as played by Russell Litchfield.
* The Chapel of Charlemagne sings a program of Gregorian chant, St. Paul's Lutheran Church, 958 Lincoln Blvd., Santa Monica. $10. (626) 332-8465.
3pm / Culture
Hear the history of the oldest existing structure in the Las Virgenes Valley and learn about homesteading in the 1880s on the Sepulveda Adobe Walk. The historic parkland is believed to have been inhabited by prehistoric peoples and more recently by the Chumash from 6000 BC to the early 1800s. In 1834, the land along Las Virgenes Creek became part of the Las Virgenes Rancho belonging to Domingo Carrillo and Nemisio Dominguez. Dominguez's daughter Maria married Pedro Sepulveda in 1859, and the couple built the two-room adobe that still stands today.
* Sepulveda Adobe Walk, Malibu Creek State Park, 1925 Las Virgenes Road, Malibu. Park in lower lot. Moderate hike. Free. (310) 457-8142.
4pm / Sing-Along
Sing! Sing! Sing!, the sophisticated sing-along at the Jazz Bakery, celebrates the lyric genius of Johnny Mercer in "The Magic of Mercer," featuring such classics as "Laura," "Come Rain or Come Shine," "Skylark" and "Goody Goody."
* "The Magic of Mercer," Jazz Bakery, 3233 Helms Ave., Helms Bakery Arts Complex, Culver City. $15. (310) 546-5470.
FREEBIE: The Martin Dancers, Lankershim Arts Center, 5108 Lankershim Blvd., North Hollywood, 3 p.m. (213) 386-6299.