Starting at noon, Washington, D.C., will be the location of the main march, on Pennsylvania Avenue between 3rd Street and 12th street NW. Sister marches are planned for Boise, Boston, Dallas, Los Angeles, Miami, New York City, and hundreds of other cities around the world. Nine marches are slated for the San Francisco Bay Area. Currently, there are a whopping 831 March for Our Lives events planned.

A deluge of celebrities have announced their support for the march, and several like George and Amal Clooney, Steven Spielberg, Kate Capshaw, Oprah Winfrey and studio chief Jeffrey Katzenberg have each pledged $500,000 for the action.

x "By a raise of hands, if you have been affected by #GunViolence, please raise your hand to honor of those you've lost"



We march for them too. #MarchForOurLives: Everything you need to know about the #NeverAgain event https://t.co/jXNQK1vPaU @AMarch4OurLives @NeverAgain pic.twitter.com/YoJNfPXGaK — Khary Penebaker (@kharyp) March 23, 2018

In addition to mostly liberal celebrities, some businesses have weighed in as well. Lyft is offering Stoneman students free rides to the march. The dating app Bumble banned images of guns from its platform and donated $100,000 to March for Our Lives. This isn’t meant to be a feel-good one-off. Besides the mission statement, the organizers write:

School safety is not a political issue. There cannot be two sides to doing everything in our power to ensure the lives and futures of children who are at risk of dying when they should be learning, playing, and growing. The mission and focus of March For Our Lives is to demand that a comprehensive and effective bill be immediately brought before Congress to address these gun issues.

At some of Saturday’s marches, participants will register voters in order to turn today’s outrage into concrete victories for gun reform-minded candidates in November’s midterm elections.

If you can’t make it to the march, there are still ways you can participate. Stoneman Douglas students put together a GoFundMe page for the event. Some of the money raised is going to sister marches and anything above the $2 million goal will go to victims’ funds.

You can also sign the organizers’ petition, calling on Congress to pass legislation to address gun violence. Read it here.

Whether you are 15 or 85, if you can, march with the students and be sure to follow up by telling lawmakers #NeverAgain.

If you live in the deep red of America, you may have given up as hopeless making calls or otherwise contacting your local Republican congressperson, senator, or state legislator to vote a certain way or support a certain program. Make an exception this time. A few of these elected representatives may change their minds.