President Donald Trump plans to address the nation from the Mall on the Fourth of July, upending tradition and bringing changes to the annual event. Details have been sparse, but here's what we know:

Where will the fireworks be?

The traditional site for the holiday's fireworks along the Lincoln Memorial Reflecting Pool has been moved, and a second fireworks show has been added. The first fireworks display will launch at 9:07 p.m. from multiple flatbed tractor-trailers parked on a mile-long stretch behind the Lincoln Memorial. The second display will take place about 15 minutes later at West Potomac Park, about 1,500 feet south of where the pyrotechnics have traditionally launched. Two private fireworks firms have teamed to put on the extended display.

When is Trump expected to speak at the Lincoln Memorial?

The Salute to America, with music, military demonstrations and flyovers by Air Force One and the Blue Angels, is to take place from 6:30 to 7:30 p.m. An area in front of the memorial will be reserved for dignitaries, family and friends and will be accessible only through tickets distributed by the White House.

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Will 'A Capitol Fourth' still go on in front of the U.S. Capitol?

Yes. The annual event, which airs on PBS, is unaffiliated with any other Fourth of July event. This year's concert, which runs from 8 to 9:30 p.m., will feature songwriting legend Carole King, singer Vanessa Williams and the National Symphony Orchestra.

How much will the additional events cost the city and the federal government?

It is unclear how much the additional events will cost the city and the federal government. The city says that Trump still has not paid the District government more than $7 million for the 2017 inauguration, which cost the city $27.3 million.

If I'm planning on going to the Mall, where do I go and how do I get there?

Metro traditionally has been the best way to reach the Mall on the Fourth of July, and the agency is planning extended rush-hour service beginning at 2 p.m. to accommodate any additional crowds. In past years, rush-hour service began at 5 p.m. The system will be open from 7 a.m. to 11:30 p.m., and off-peak fares will be in effect throughout the day.

Arlington Memorial Bridge, which has been open in past years, will be closed for the day, cutting off people trying to drive into the District from Arlington National Cemetery and other nearby points. Boaters will not be able to anchor between the Theodore Roosevelt and Arlington Memorial bridges.

If you're planning on flying, the flyovers could impact travel. There could be air closure of up to an hour and 15 minutes for those using National Airport between 6:30 and 7 p.m.

This article was written by a reporter for The Washington Post.