The attacks on the World Trade Center and Pentagon happened 20 years ago, but their impact continues to be felt.

LOS ANGELES, Calif. (CBSLA) – On Saturday, Southern Californians will commemorate the 20th anniversary of the terrorist events on September 11, 2001.

On the morning of September 11, 2001, over 3,000 people were murdered in four coordinated assaults on the World Trade Center in New York, the Pentagon in Washington, D.C., and an aircraft crash into a field in Pennsylvania. Sept. 11 has been designated a national day of service and commemoration for the last 20 years.

READ MORE: The Flag Memorial in Riverside, which honors 13 fallen service members, is being torn down.

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MALIBU, CA – SEPTEMBER 09: Eran and Ruth Kahn, on vacation from Israel for the first time, pay a visit to Pepperdine University’s annual Waves of Flags exhibit and commemoration on September 9, 2021. – For the fourteenth year, the institution, which is located adjacent to the Pacific Coast Highway and the Pacific Ocean, is honoring the occasion by flying almost 3,000 American flags, as well as international flags for each country that lost a person in the 911 attacks. On September 11, Pepperdine University will have its 14th annual Waves of Flags show to honor those who lost their lives or loved ones in the terrorist attacks of September 11, 2001. On Thursday, September 9, 2021, in Malibu, CA, at Pepperdine Alumni Park. (Getty Images/Al Seib / Los Angeles Times)

Every year at Pepperdine University in Malibu, one of Southern California’s longest-running September 11 memorials takes place. The Waves of Flags exhibit includes 2,977 flags between Pacific Coast Highway and Malibu Canyon Road in the university’s Alumni Park. Each individual killed in the assault is commemorated with a banner, which includes national flags from each foreign country that lost a citizen. The flags will be raised on Wednesday and lowered on the 26th of September. On Sept. 11, Pepperdine will host a number of memorial events.

Sept. 11 memorial activities will also be held at the Nixon Library in Yorba Linda and the Reagan Library in Simi Valley. The memorial event at the Nixon Library starts at 11 a.m. and will include 23 tons of World Trade Center debris as its centerpiece. The evening event at the Reagan Library will include keynote speeches from retired Col. David Sutherland and former NYPD Officer Marc Manfro. Both programs are free, but attendees must register in advance online.

READ MORE: Dramatic Photo Shows Aliso Viejo Home On Fire Following Lightning Strike

At 8 a.m. Saturday, all San Bernardino County fire stations will have a 15-minute Reflection Ceremony. Each ceremony will feature a reflection on the events of the day, the lowering of the United States flag to half-staff, and the ringing of the bell.

At 9 a.m., the communities of Signal Hill and Long Beach will hold “A Celebration of Peace and Unity” at the Signal Hill Unity Monument on Temple and Hill streets in Signal Hill. Because parking is limited, attendees are encouraged to RSVP at (562) 989-7330 and carpool or utilize a rideshare service.

The first-ever 9/11 Flag of Honor Around America Memorial will be held in the Santa Barbara Courthouse Sunken Gardens at 9 a.m., one of 60 across the nation as part of a 9/11 Day event organized by Global Youth Justice Inc. and funded by AmeriCorps.

ADDITIONAL NEWS: A man was discovered dead at Debs Park in Montecito Heights, and a homicide investigation is underway.

In the city of Beverly Hills’ 9/11 Memorial Garden, the city will conduct its yearly ceremony. In collaboration with the city of Los Angeles, the event will feature a wreath laying, ringing of the bell, playing of taps, a 21-gun salute, and a flyover at 5:30 p.m. The 9/11 Memorial Garden, located at 445 N. Rexford Drive, is accessible daily and has a floor beam from the Twin Towers in the middle.

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