10 am: Gardening

The theme for this year’s Huntington Library plant sale is “Something Old, Something New, Something Borrowed, Something Blue,” and plants in each of the four categories will be available. Featuring thousands of rare and exotic plants from the gardens of the venerable San Marino estate, this popular garden event will include cuttings from collectors, unusual varieties of cactuses and succulents, orchids and tropicals, roses, camellias, herbs, trees and vines.

* The Huntington’s 24th Annual Plant Sale. The Huntington Library, Art Collections and Botanical Gardens parking lot, 1151 Oxford Road, San Marino. Sunday, 10 a.m.-4 p.m. A preview sale for members of Huntington support groups will be held Saturday, 4:30-7 p.m. Free. (626) 405-2100.

7 pm: Pop Music

Challengers keep coming, but Boyz II Men remains the preeminent romantic vocal harmony group in contemporary R&B.; Underscoring the value of its voices, the Philly foursome is mounting an anti-smoking campaign in conjunction with its current concert tour.

* Boyz II Men at the Great Western Forum, 3900 W. Manchester Blvd., Inglewood. $25-$45. (310) 419-3100. Also Tuesday, 7:30 p.m., at Irvine Meadows Amphitheatre, 8800 Irvine Center Drive, Irvine. $20-$45. (714) 855-4515.

11 am: Art

More than 50 artists will open their private studios and homes to the public for the 19th annual Venice Art Walk, a day of self-guided studio tours to benefit the Venice Family Clinic. In addition to tours and art exhibitions, the day will also feature various arts activities, including a silent art auction of works by more than 300 artists, a marketplace with handcrafted items and functional artworks, a food fair, cartoon gallery, cooking demonstrations and a children’s art center, where families can create murals, masks and puppets.

* Venice Art Walk. Registration begins at the Westminster School, 1010 Abbot Kinney Blvd., Venice. 11 a.m.-5 p.m. Studios open at noon. Continuous shuttle service will be available from Walgrove Elementary School, 1630 Walgrove Ave., Mar Vista, and Broadway Elementary School, 1015 Lincoln Blvd., Venice, 10:30 a.m.-7 p.m. Tickets, $45. Daylong docent tours will be conducted Saturday, 11 a.m.-4 p.m. and Sunday, 10:30 a.m.-3 p.m. Tickets are $110 and include lunch, an art auction preview on Saturday and admission to the Art Walk. (310) 392-9255.

1 pm: Jazz

Anita O’Day came out of the ‘40s big bands of Gene Krupa and Stan Kenton to become one of the most recognized of all jazz singers. Life has not been easy, as she details in her excellent 1981 autobiography, “High Times, Hard Times,” and her journey has always been reflected in her work. Here, the 78-year-old O’Day will be honored in a concert hosted by Steve Allen and Carl Reiner. And yes, O’Day will sing. Reservations are recommended.

* Tribute to Anita O’Day, Jazz Bakery, 3233 Helms Ave., Culver City. $25. (310) 271-9039.

All Day: Museum Freebies

In honor of National Museum Day, free admission to the following museums will be offered on “Museums of the Arroyo Day”: the Southwest Museum, Lummis Home, Heritage Square Museum, Pasadena Historical Museum and the Gamble House, from 11 a.m. to 5 p.m. At the other end of the Arroyo Seco Parkway (the Pasadena Freeway), MOCA will host a free “Family Festival” from 1-5 p.m. with student-led discussions of “Timepieces: Selected Highlights From the Permanent Collection,” calligraphy demonstrations, silk-screen monoprinting with artist Isabel Martinez and presentations on photography with Catherine Opie and students from Rosemont Elementary School.

* “Museums of the Arroyo Day.” Southwest Museum, 234 Museum Drive, Los Angeles, (213) 221-2164. Gamble House, 4 Westmoreland Place, Pasadena, (626) 793-3334. Lummis Home, 200 E. Ave. 43, Los Angeles (213) 222-0546. Pasadena Historical Museum, 470 W. Walnut St., (626) 577-1660. Heritage Square Museum, 3800 Homer St., Los Angeles, (626) 796-2898. 11 a.m.-5 p.m. “MOCA Family Festival.” Museum of Contemporary Art, 250 S. Grand Ave., downtown. 1-5 p.m. (213) 626-6222.

8 pm: Music

James Levine brings his Metropolitan Opera Orchestra to retrofitted Royce Hall at UCLA in a program that ought to show off both ensemble and room: Rossini’s “Semiramide” Overture, Tan Dun’s “Death and Fire,” the Tchaikovsky Violin Concerto with soloist Maxim Vengerov and Ravel’s Suite No. 2 from “Daphnis et Chloe.”

* James Levine conducts the Met Orchestra at Royce Hall, UCLA, Westwood. $16-$70. (310) 825-2101.

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FREEBIE: Playboy Latin Jazz Jam with percussionist Ray Barretto, Conga Room, Los Angeles, 8 p.m. (310) 449-4070.