After the results of the US election were announced, a retired attorney in Hawaii took to Facebook to make a suggestion. Why, suggested Teresa Shook, didn’t women who were upset with the result gather for a march in Washington on Inauguration Day?

That was in November. Since then, the Women’s March on Washington (as it is now formally known) has grown to include over 100,000 registered attendees. Some 150,000 people have clicked “attending” on the event’s Facebook page, and organisers estimate 200,000 people will participate in the protest once inauguration weekend rolls around. As a result, the Washington Post reports that the march is likely to be the biggest protest over the weekend Donald Trump is sworn in as President of the United States.

“We plan to make a bold and clear statement to this country on the national and local level that we will not be silent and we will not let anyone roll back the rights we have fought for and struggled to get,” Tamika Mallory, one of the march’s main organisers, tells the Post.

Here’s everything you need to know about the Women’s March on Washington