Tens of thousands of people will endorse nationwide protests in the US over the Trump government's strict migration policies
More than 630 events are planned, calling for the separation of migrant families at the US border.
About 2000 children remain separated from their parents, though President Donald Trump's executive order ended the controversial policy.
He bowed to public pressure after weeks of domestic and international outrage.
The order prevented children from being taken by parents under the President's "Zero Tolerance Policy" against illegal crossings of the US border in Mexico.
Faced with a backlash, President Trump instead pledged to "keep families together" in migrant detention centers.
- Migrant Family Separation: The Big Picture Explained
Critics say, however, that the order does not address the issue of families already separated, with 2,342 children taken away from their parents between May 5 and June 9 alone.
Earlier this week, a judge in California's Families Reunited Within 30 Days
It's probably one of the biggest protests against immigration, an issue that has proved very divisive under Donald Trump's presidency, reports David Willis of the Los Angeles BBC ].
What do the protesters want?
People in many major US cities were invited to meet under the slogan #families. The organizers say they want to send a message to President Trump whom they fear will return to his executive office.
"We can not slow down now because the court decision alone is not enough and could be overturned"
The organizers not only call for parents with their children, but also demand an end to immigration detention ̵
Much of the turmoil over separation politics came after news organizations reported that children are being held in cells, converted warehouses, and desert tents across the country.
The organizers expect tens of thousands of people to show up, with instructions to dress in white to represent peace and unity. The main march takes place in Washington DC, but one of the individuals behind the movement, Anna Galland, says there will be separate events in 50 states
The organization's leading organizers include the American Civil Liberties Union, The Leadership Conference on Civil Rights and the National Domestic Workers Alliance
A number of celebrities have also expressed their support, including actresses Julianne Moore, America Ferrara and Natalie Portman, and Lin-Manuel Miranda, creator of the hit musical Hamilton.
It is not the first such protest, in which nearly 600 women were arrested on Thursday in a sit-in in a US Senate building against the government's migration policy. The actress Susan Sarandon was among the detainees.
Many were wrapped in foil to show the threadbare bedding for migrant children in border detention facilities.
What is politics?
President Trump has defended "zero tolerance," say officials who only enforce the law.
Following a crackdown by the Trump administration in May, all frontier workers – including first-time offenders – are being criminally charged and imprisoned.
Migrant children are not allowed to be detained by their parents and are housed in separate facilities of the Ministry of Health
Authorities were confronted with subpoenas by illegal immigrants who had crossed the border for the first time.
But the Trump Administration p points out that most of these migrants never appeared in court.