Ashira Boxman hugs her father, Rabbi Bradd Boxman of Congregation Kol Tikvah, which lost three members in last Wednesday's mass shooting at Marjory Stoneman Douglas High School, at a rally for gun control reform on the steps of the state capitol, in Tallahassee, Florida, Wednesday, February 21, 2018. Credit: Gerald Herbert | AP

WASHINGTON — Organizers of a rally against mass shootings planned for next month in Washington are expecting up to 500,000 attendees, according to an event permit application.

The application filed this week with the National Park Service indicates the “March For Our Lives” will be March 24, although a location hasn’t been determined. The rally, organized by survivors of last week’s school massacre in Parkland, Florida, will have “sister marches” in other major cities, organizers said.

The event will include “student speakers, musical performers, guest speakers and video tributes,” according to the permit application, with 14 Jumbotrons and 2,000 chairs.

Mike Litterst, a spokesman for the National Park Service, said organizers initially proposed holding the event on the Mall, but were looking at moving the rally to another location in Washington.

“We’ve had our first meeting with the organizers and for scheduling and logistics reasons they are now focusing on alternate locations for the event, including Pennsylvania Avenue and West Potomac Park,” Litterst wrote in an email.

The permit was filed by Deena Katz, identified by the Miami Herald as the co-executive producer of “Dancing With the Stars,” who was brought in by students to plan the event. Organizers have secured nearly $2 million in donations via a GoFundMe page, along with donations from Oprah Winfrey, Steven Spielberg and George and Amal Clooney.

“March For Our Lives is created by students across the country who will no longer risk their lives waiting for someone else to take action to stop the epidemic of mass school shootings that has become all too familiar,” the permit application read. “In the tragic wake of the seventeen lives brutally cut short in Florida, politicians are telling us that now is not the time to talk about guns. March For Our Lives believes the time is now.”

Katz couldn’t be reached for comment on Thursday.

In a video this week announcing the march, shooting survivor Cameron Kasky said students in other major cities would march in solidarity.

“We have on our lives on the line here,” he said.

The rally’s website and Facebook page indicate marches in London, Philadelphia, Houston and Broward County, Florida, where 19-year-old Nikolas Cruz admitted to killing 17 people at Marjory Stoneman Douglas High School on Feb. 14.

In the video announcing the rally, shooting survivor Emma Gonzalez said students wanted conversations with President Donald Trump, Sen. Marco Rubio, R-Fla., and Florida’s Republican Gov. Rick Scott about their support from the NRA and to “give them the opportunity to be on the right side of this.”

“If they don’t turn around right now and state their open support for this movement, they are going to be left behind,” Gonzalez said. “You are either with us or against us.”

On Tuesday, Winfrey tweeted: “These inspiring young people remind me of the Freedom Riders of the 60s who also said we’ve had ENOUGH and our voices will be heard.”