The Women's March returned to dozens of cities across the country this weekend, with women and their allies protesting President Donald Trump's agenda and calling for political power at the polls.

The main event for the 2018 Women's March, entitled "Power to the Polls," will take place Sunday in Las Vegas. But hundreds of other anniversary marches and events were held elsewhere in the nation -- and around the world -- on Saturday.

Here are some of the images of the marchers and their signs:

Thousands of marchers fill the streets at the Women's March in San Francisco, Jan. 20, 2018.(Thor Swift/Polaris) Thousands of marchers fill the streets at the Women's March in San Francisco, Jan. 20, 2018.
Activists participate in a demonstration for women's rights in Berlin, Jan. 21, 2018.(Adam Berry/Getty Images) Activists participate in a demonstration for women's rights in Berlin, Jan. 21, 2018.
Participants chant "Times Up" as they stage a rally on the anniversary of the Women's March in London, Jan. 21, 2018.(Guy Bell/REX/Shutterstock) Participants chant "Times Up" as they stage a rally on the anniversary of the Women's March in London, Jan. 21, 2018.
A protester holds a sign following the Women's March on Washington 2018: March On The Polls! at the National Mall, Jan. 20, 2018 in Washington D.C.(Andrew Caballero-Reynolds/AFP/Getty Images) A protester holds a sign following the Women's March on Washington 2018: March On The Polls! at the National Mall, Jan. 20, 2018 in Washington D.C.
A protester holds up a placard during the Women's March in central London, Jan. 21, 2018 as part of a global day of protests, a year to the day since Donald Trump took office as U.S. president.(Daniel Leal-Olivas/AFP/Getty Images) A protester holds up a placard during the Women's March in central London, Jan. 21, 2018 as part of a global day of protests, a year to the day since Donald Trump took office as U.S. president.
Orla Dean, 5, holds a placard during the Time's Up rally at Richmond Terrace, opposite Downing Street, Jan. 21, 2018 in London. The Time's Up Women's March marks the one year anniversary of the first Women's March in London and in 2018 it is inspired by the Time's Up movement against sexual abuse.(Chris J Ratcliffe/Getty Images) Orla Dean, 5, holds a placard during the Time's Up rally at Richmond Terrace, opposite Downing Street, Jan. 21, 2018 in London. The Time's Up Women's March marks the one year anniversary of the first Women's March in London and in 2018 it is inspired by the Time's Up movement against sexual abuse.
A participant takes a selfie in front of posters supporting women's rights during a Women's March in Los Angeles, Jan. 20, 2018.(Jae C. Hong/AP Photo) A participant takes a selfie in front of posters supporting women's rights during a Women's March in Los Angeles, Jan. 20, 2018.
A participant in the New York City march with her sign, Jan. 20, 1918. (Emily Knapp/ABC News) A participant in the New York City march with her sign, Jan. 20, 1918.
Participants in the New York City March as they passed the Trump International Hotel and Tower on Central Park West, Jan. 20, 2018. (Emily Knapp/ABC News) Participants in the New York City March as they passed the Trump International Hotel and Tower on Central Park West, Jan. 20, 2018.
A sign held by one of the participants, part of a 500,000 strong crowd,in Los Angeles, Calif. on Jan. 20, 2018.(Mark Ralston/AFP/Getty Images) A sign held by one of the participants, part of a 500,000 strong crowd,in Los Angeles, Calif. on Jan. 20, 2018.
Kiara Romero from Rockville, Md., joins the Women's March demonstrators as they walk past the White House in Washington, D.C.,Jan. 20, 2018. (Pablo Martinez Monsivais/AP Photo) Kiara Romero from Rockville, Md., joins the Women's March demonstrators as they walk past the White House in Washington, D.C.,Jan. 20, 2018.
One of the participants at the 2018 Women's March in Los Angeles, Jan. 20, 2018.  (Araya Diaz/Getty Images) One of the participants at the 2018 Women's March in Los Angeles, Jan. 20, 2018.
Participants marching towards the Museum of Art in Philadelphia, Pa., Jan. 20, 2018.(Joe Lambert/Courier Post via USA TODAY NETWORK ) Participants marching towards the Museum of Art in Philadelphia, Pa., Jan. 20, 2018.
One of the many signs that were on display during the 2018 Women's March at Pershing Square in Los Angeles, Calif., January 20, 2018.(Araya Diaz/Getty Images) One of the many signs that were on display during the 2018 Women's March at Pershing Square in Los Angeles, Calif., January 20, 2018.
Yoko Ono at the Women's March rally in New York City, Jan. 20, 2018.(Kristin Callahan/ACE Pictures/REX/Shutterstock ) Yoko Ono at the Women's March rally in New York City, Jan. 20, 2018.
Thousands of people participate in the Women's March, beside the Lincoln Memorial Reflecting Pool in Washington, D.C., Jan. 20, 2018.(Michael Reynolds/EPA) Thousands of people participate in the Women's March, beside the Lincoln Memorial Reflecting Pool in Washington, D.C., Jan. 20, 2018.
A woman holds a sign during the Women's March on the National Mall, Jan. 20, 2018 in Washington D.C.(Andre Caballero-Reynolds/AFP/Getty Images) A woman holds a sign during the Women's March on the National Mall, Jan. 20, 2018 in Washington D.C.
A view of the Women's March during Sundance Film Festival 2018, Jan. 20, 2018 in Park City, Utah.(Tommaso Boddi/Getty Images) A view of the Women's March during Sundance Film Festival 2018, Jan. 20, 2018 in Park City, Utah.
Cathryn Harjung of Elkton, Md. holds her sign before the start of the Women's March in Newark, N.J.(Jason Minto/The News Journal via USA Today Network) Cathryn Harjung of Elkton, Md. holds her sign before the start of the Women's March in Newark, N.J.
People take part in the Women's March in New York City, Jan. 20, 2018.(Eduardo Munoz/Reuters) People take part in the Women's March in New York City, Jan. 20, 2018.
A man holds a sign as he attends the Womens March, Jan. 20, 2018 in New York City.(Kena Betancur/AFP/Getty Images) A man holds a sign as he attends the Womens March, Jan. 20, 2018 in New York City.
People took to the streets of downtown Los Angeles for the Women's March, Jan. 20, 2018.(Chelsea Lauren/REX/Shutterstock) People took to the streets of downtown Los Angeles for the Women's March, Jan. 20, 2018.
A protester in Morristown, N.J., holds a sign focusing on the upcoming midterm elections, Jan. 20, 2018.(John Chadwick) A protester in Morristown, N.J., holds a sign focusing on the upcoming midterm elections, Jan. 20, 2018.
People participate in the second annual Women's March in Washington, D.C., Jan. 20, 2018.(Aaron Bernstein/Reuters) People participate in the second annual Women's March in Washington, D.C., Jan. 20, 2018.
People gather prior to the second annual Women's March, Jan. 20, 2018 in New York City.(Kena Betancur/AFP/Getty Images) People gather prior to the second annual Women's March, Jan. 20, 2018 in New York City.
Thousands of men and women hold signs and rally while attending the Women's March, Jan. 20, 2018 in New York.(Spencer Platt/Getty Images) Thousands of men and women hold signs and rally while attending the Women's March, Jan. 20, 2018 in New York.