Nov. 19-20: RiverBlue, SF Youth Symphony, SF Symphony Benefit for the North Bay, Jose Lopez, George Lakey, Bay Area Record Fair, Tenors, Ciaramella, Lazuli String Quartet, Mark Olson


RiverBlue: The documentary follows conservationist Mark Angelo as he exposes how fashion industry practices are destroying the world’s rivers; the screening is followed by a panel discussion with industry experts. [3:30 p.m., Roxie, 3117 16th St., S.F.]

San Francisco Youth Symphony: Christian Reif conducts Elgar’s “Enigma” Variations, Detlev Glanert’s Prelude No. 1 from Three American Preludes and concerto competition winner Leyla Kabuli performs Rachmaninoff’s Piano Concerto No. 2. [2 p.m., Davies Symphony Hall, 201 Van Ness Ave., S.F.]

Symphony Relief-A Benefit Concert for the North Bay
: Michael Tilson Thomas, the San Francisco Symphony and Symphony Chorus and guest stars play the special program of music by Beethoven, Tchaikovsky and Copland. [7:30 p.m., Davies Symphony Hall, 201 Van Ness Ave., S.F.]

Pier 39 Tree Lighting: A 60-foot Christmas tree will be illuminated at 6 p.m., preceded by seasonal festivities including a performance by Mariachi Divas. [Noon to 6:30 p.m., Pier 39, Embarcadero, S.F.]

Jose Lopez: The pianist plays works by Cuban-born composers Jose Comellas and Nicolas Ruiz Espadero as well as Alkan’s “Symphonie.” [4 p.m., Old First Church, 1751 Sacramento St., S.F.]

George Lakey: The activist, sociologist and author of “Viking Economics: How the Scandinavians Got It Right-and How We Can, Too” presents a talk, “A Nation Divided: What Can We Learn From The Nordics?” [6 p.m., City Lights, 261 Columbus Ave., S.F.]

Bay Area Record Fair: Noise Pop & Amoeba Music present the free event, which brings together Bay Area independent record labels for community, camaraderie and commerce. [Noon to 5 p.m., Swedish American Hall and Cafe du Nord, 2174 Market St., S.F.]

Gary Numan: The eclectic songwriter and producer — who has influenced artists from Lady Gaga to Beck to Jack White — has released his 22nd studio album “Savage (Songs from a Broken World)” in 2017. [8 p.m., Fillmore, 1805 Geary Blvd., S.F.]

The Tenors: The pop opera trio — Victor Micallef, Clifton Murray and Fraser Walters — appear on their “Christmas Together Tour.” [8 p.m., Herbst Theatre, 401 Van Ness Ave., S.F.]

Ciaramella: The San Francisco Early Music Society presents the Los Angeles-based group in “1517—German Music Before and After the Reformation,” a program performed on recorders, shawms, bagpipes, viola da gamba, lute and guitar. [4 p.m., St. Mark’s Lutheran Church, 1111 O’Farrell St., S.F.]

Unitarian Universalist Sunday Forum: Linda Harris, local representative of the Unitarian Universalist Service Committee, describes its projects and partnerships and offers information to those who want to participate. [9:30 a.m., First Unitarian Universalist Society, 1187 Franklin St., S.F.]

Lazuli String Quartet: The S.F. Conservatory of Music ensemble plays works by Henry Purcell, Rebecca Clarke, Frank Bridge, and Benjamin Britten, presented by Noe Valley Chamber Music. [4 p.m., Noe Valley Ministry, 1021 Sanchez St., S.F.]

Ensemble for These Times: Soprano Nanette McGuinness, pianist Dale Tsang and cellist Anne Lerner-Wright play 20th and 21st century music by E4TT co-director David Garner, Elinor Armer, Patrick Castillo, Morgan Greenwood, Andrew List, William Price, Arthur Gottschalk and Jessica Rudman. [4 p.m., Berkeley Piano Club, 2724 Haste St., Berkeley]

First Second Books-A Graphic Revolution: Artists and authors from First Second Books (Thien Pham, Jason Shiga, Gene Luen Yang and others) discuss their graphic novels, in connection with an exhibit in which they’re featured. [1 to 3 p.m., Koret Auditorium, Main Library, 100 Larkin St., S.F.]

Howard Zinn Book Fair: Writers and publishers gather to consider “the value of dissident histories” in the spirit of the late activist and author of “A People’s History of the United States.” [10 a.m. to 6 p.m., City College of S.F., 1125 Valencia St., S.F.]


Mark Olson: The musician, notable for his work with the pioneering Americana band The Jayhawks, is touring with his wife and musical partner Ingunn Ringvold, promoting their new album “Spokeswoman of the Bright Sun.” [8 p.m., Lost Church, 65 Capp St., S.F.]

ReOrient 2017: Golden Thread Productions, which is dedicated to covering the Middle Eastern experience, opens its annual festival of seven short plays featuring themes and artists from Armenia, Iraq, Iran, Japan, Lebanon, Palestine, Tunisia, Turkey, the United Kingdom and the U.S. [8 p.m., Potrero Stage, 1695 18th St., S.F.]

Andy Weir: The bestselling author of “The Martian” speaks with science journalist Kara Platoni about his new novel “Artemis,” a near-future crime caper set on the moon, in a ticketed event. [7:30 p.m., Kepler’s, 1010 El Camino Real, Menlo Park]

Julia Jacklin: The Australian singer-songwriter’s wild range of influences includes Doris Day, The Andrews Sisters, Björk and Billy Bragg. [8:30 p.m., Cafe Du Nord, 2170 Market St., S.F.]

Trevor Noah: The funny, erudite “Daily Show” host appears in the first of six standup comedy performances. [7 p.m., Masonic, 1111 California St., S.F.]

Adam Jacobs and Arielle Jacobs: Bay Area Cabaret presents the Bay Area-bred musical theater brother and sister in “Sibling Disobedience: Breaking the Rules on the Way to the Great White Way.” [7:30 p.m., Venetian Room, Fairmont, 950 Mason St., S.F.]

Our Lady Peace: The Juno award-winning Canadian alt-grunge rock band took its name from a poem by American writer Mark Van Doren. [8 p.m. Independent, 628 Divisadero St., S.F.]

Jessica Yu: The Oscar-winning filmmaker discusses ”Garden of the Lost and Abandoned: The Extraordinary Story of One Ordinary Woman and the Children She Saves, ” her book about Gladys Kalibbala, a journalist who rescues lost children in Uganda. [7 p.m., Books Inc., 317 Castro St., S.F.]