As well as reuniting parents with their children, organisers are calling for an end to immigrant detention - even when families are kept together - and also plan to voice opposition to President Trump's travel ban targeting five majority-Muslim nations, which was upheld by the US Supreme Court earlier this week.
Rachel Gregory, 39, was one 575 activists arrested Thursday during a protest at a US Senate office building.
Capitol Police arrested almost 600 people, who engaged in protests with several Democrat lawmakers.
Attendees will include several women who also participated in Thursday's demonstration and were arrested by U.S. Capitol Police. That police had led to the separation of thousands of children from their parents before the Trump administration halted the separations in late June. Other famous names who attended the event include Eugenio Derbez, Laverne Cox and rapper Taboo. "We have a situation where the Trump administration seems to be aiming to detain families", said Karthik Ganapathy, a MoveOn.org spokesman.
Capitol Police arrested almost 600 Women's March protesters who filled the atrium of the Hart Senate Office Building on Capitol Hill today in opposition to the Trump administration's "zero-tolerance" border enforcement policies.
At the rally, Robert Burghduf of Allendale carried a sign that read "We Need to Fix our Moral Compass". The protestors say they want more transparency on what happens next to those children.
Bulldog named Zsa Zsa wins World's Ugliest Dog contest
Last year's victor was a 125-pound (57-kilogram) gentle giant named Martha - a Neopolitan Mastiff with gas and a droopy face. The dog's owner, Megan Brainard , found the dog through a pet-finding site and she has now won $1,500 for Zsa Zsa's win.
This week, a federal judge in San Diego ordered the government to quickly reunite migrant children with their families, though it's not yet clear how officials will meet the court's deadlines for doing so. "There is just nothing worse to me".
In April, Attorney General Jeff Sessions announced a "zero tolerance" immigration policy, directing federal prosecutors to criminally prosecute all adults crossing the border illegally.
"If you are pro-family, you can not separate families", Los Angeles Mayor Eric Garcetti said to the crowd at Los Angeles City Hall.
"This was a tipping point", said Sullivan, a professor who splits her time between McLean Va. and Miami Fla.
Trump says illegal immigration fosters crime and he implemented a "zero tolerance" policy in May to prosecute all immigrants apprehended for entering illegally.
"To finally have people on board wanting to take action, marching, taking to the streets", Ms Rivas said.
"I think if you asked someone on the street, 'Is it a political question whether we should tear babies out of their mother's arms?' they would say, 'No, that's a moral question, ' " Galland told CNN's Christi Paul.
Rapper XXXTentacion reportedly shot dead in Florida
The move came as part of Spotify's attempt to condemn artists who break a "hate content and hateful conduct" policy. Cole called him an "enormous talent" with "limitless potential". "God bless his family, friends and fans".
Ivanka urged Trump to address family separation
Every day, child welfare agencies across America make hard decisions to separate children from their parents. Democrats welcomed Trump's apparent change of course but said he had only himself to blame.
Blatter says England should host World Cup
The Kremlin has said US national security adviser John Bolton plans to visit Moscow, without providing details about the trip. Former FIFA President Sepp Blatter claims that VAR is failing due to a lack of consistency.
Melania Trump makes second border visit to see migrant children
But the states say his order is riddled with caveats and fails to reunite parents and children who have already been torn apart. They were placed in government-contracted shelters, some of them hundreds of miles from where their parents were being held.