The revamped festivities will include additional fireworks, military bands and flyovers by Air Force One, the Blue Angels and aircraft from all branches of the military.

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However, some details — including how the VIP section will operate and how it will affect the access and sightline for the general viewing area — still are unclear.

Many people who have long-standing practices for how they get downtown, or where they position their boats for the best vantage points and ease of access, will need to make adjustments. Even travelers passing through the region’s skies will be affected, with all operations at Reagan National Airport suspended for up to an hour and 15 minutes on July 4, the FAA said late Friday.

Local and federal officials on Friday held a news conference to address security issues and deliver updates on the plans still unfurling just days before usually large crowds descend on the Mall from across the region and the country.

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The ongoing shifts to what had been established security and crowd-control protocols have left officials in the District and some federal agencies confused about logistics as basic as what Metro stops and roads might be open or closed, and for what period, and how many fireworks displays will launch.

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On Friday morning, bleachers had been set up on the plaza below the Lincoln Memorial, and workers were erecting other structures. Seats faced away from the memorial and toward the Washington Monument, making it unclear where exactly Trump plans to stand while giving his speech.

Representatives from the Secret Service and the Interior Department referred questions about tickets to the VIP area and how to obtain them to the White House, which said only that the tickets were free. The prime seating comes with additional security screening.

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The ramifications of adding the president’s speech to the July 4 lineup, adding another fireworks show and shifting the fireworks’ location already were having a sooner-than-expected impact.

In West Potomac Park, softball fields were fenced off Friday morning, a day earlier than had been announced, while 36 portable spotlights were parked along Ohio Drive. A crew from Garden State Fireworks was setting up its launch site near a baseball backstop.

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Come July 4, the Arlington Memorial Bridge, a major thoroughfare that was open in the past on the holiday, will be closed for the day, cutting off people trying to drive into the District from Arlington National Cemetery and other nearby points. Transportation officials warned that the Smithsonian and Foggy Bottom Metro stops could experience extra crowding as a result.

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Also, because of the shift in the fireworks launch, boaters accustomed to anchoring between the Theodore Roosevelt Bridge and the Arlington Memorial Bridge will be moved to an area on the west side of the Potomac River near the 14th Street Bridge.

The disruption to air traffic will occur at Reagan National but not Dulles International or Baltimore-Washington International Marshall airports, the FAA said.

In a statement, the agency said it has previously suspended operations at National “for a similar amount of time for other events,” but a spokeswoman was unable to provide examples Friday. She could not say during what hour flight operations would be suspended or whether the extended fireworks display or the flyovers in the July 4 celebration had prompted the decision.

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Still unanswered is whether the activist group Code Pink can fly its “Baby Trump” protest balloon, and where. Helium balloons are barred from the Mall at all times, including during the event.

Jeff Reinbold, the National Park Service superintendent for the National Mall and Memorial Parks, said the group might be able to use “cold air” to keep the balloon low to the ground and avoid restricted airspace. Cold air is used in stationary inflatables typically found flapping outside tax offices and car dealerships. Also unclear is whether people can take in smaller versions of the Baby Trump balloons being promoted on social media.

What was clear after Friday’s news conference is that the president’s vision for a grand affair, with elements of the military-style parade he has long sought and local officials have resisted, seems to be coming together.

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Del. Eleanor Holmes Norton (D-D.C.), the city’s nonvoting representative in Congress, has said she worries Trump’s appearance could turn the holiday into a spectacle, and D.C. Mayor Muriel E. Bowser (D) has said she hopes Trump “recognizes that the event is a unifying event that celebrates the birthday of our nation.”

On Friday, Bowser and D.C. Police Chief Peter Newsham tried to focus on the more functional aspects of governance: updates on road closures, cooling centers, aid stations, appeals for patience and cautions about travel delays.

With July 4 expected to be “very hot, very very hot,” Bowser said, they urged people to frequently check the government website (www.dc.gov/fourthofjuly) and text JULY4DC to 888-777 to receive alerts to help navigate the day.

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Reinbold, the Park Service superintendent, said the first fireworks show will go off at 9:07 p.m. The fireworks will be ignited from flatbed trailers parked on a mile-long stretch behind the Lincoln Memorial. He described it as a horizontal show low to the ground, with the effect of wrapping around the memorial. That will be followed by the more traditional show that will last 20 minutes.

He said spectators will see 35 minutes of fireworks, longer than in past years. “It will be quite a display,” he said, and “will end with a booming 1,000-foot-high show. It should be in­cred­ibly dramatic.”

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He said the best place to view the fireworks will be the Mall, “because you’ll get to see both” shows.

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Felix “Phil” Grucci Jr., president of Grucci Fireworks, which is putting on the first display behind the Lincoln Memorial, said in an interview that a team of “over 30 pyrotechnicians” had started working June 24 to assemble the display off-site. Equipment will be moved to the Mall on Wednesday.

Grucci’s firm launched fireworks on the Mall in 1991 for the Park Service and has done shows for every presidential inauguration that had pyrotechnics since Ronald Reagan.

“Our performance area is now about a mile wide in the sky,” Grucci said.

Asked how many pyrotechnics were involved, Grucci demurred. “It’s almost like asking a sculptor how many pounds of clay did you use, or a painter, how many gallons of paint did you use, to create a performance.”