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It's Fourth of July in Washington DC, where a large gathering is expected to celebrate on the National Mall for America's 250th birthday.Whether you celebrate alongside tens of thousands of others in the heart of the District or choose to view the fireworks from a different vantage point, here's a guide to navigating the day's festivities.What to know about Salute to America fireworks showA large perimeter will be closed off around the National Mall for Salute to America, a White House-led Fourth of July celebration that will include a speech by President Donald Trump and fireworks.The tentative schedule, which was updated Thursday, says fireworks will begin at 10:30 p.m. Considered "the largest fireworks display in history," 850,000 shells will be launched from 10 sites: the Lincoln Memorial Reflecting pool, West Potomac Park and barges along the Potomac River.When should you arrive to Salute to America?With heat indices expected to climb into the triple digits, Freedom 250 organizers modified the schedule to reduce attendees' exposure during the hottest part of the day.Now, the Washington Monuments grounds do not open to the public until 5 p.m. The nighttime programming begins at 7 p.m.Although it's unclear when the best time to arrive to the Mall is, organizers expect a capacity crowd of 150,000 people to attend the event.What can you bring to National Mall on July 4?Attendees are now allowed to bring an empty, non-metal water bottle to the National Mall. There will be multiple complimentary refill stations, and organizers also plan to distribute free water bottles.Blankets are allowed, as is one of the following: a clear, see-through bag that does not exceed 12 inches by 6 inches by 12 inches, or a small clutch or purse not larger than 10 inches by 6 inches by 2 inches.What is not allowed at National Mall on July 4?Salute to America is expected to have TSA-like security measures, and the following items will not be allowed: aerosols including bug spray and sunscreen, glass or metal containers, ammunition, animals except service animals, backpacks, balloons, balls and frisbees, bicycles, bull horns and noise makers, camping chairs and folding chairs, coolers, drink tumblers, drones, flammable liquids, vapes and smokeless tobacco, laser pointers, lighters, mace and pepper spray, packages, pocket knives, range finders, recreational motorized mobility devices, selfie sticks, signs exceeding 20 inches by 3 inches by a quarter-inch. skateboards and scooters, explosives, firearms, toy guns and weapons of any kind.The list of prohibited items follows guidelines from the U.S. Secret Service. Organizers say any items surrendered at the checkpoints "will be discarded or turned over for destruction."How to navigate the Metro in Washington DC on July 4Metro Rail will be free from 5 p.m. to 2 a.m. today, with additional trains going into service beginning at 5 p.m.Metro said trains will arrive every 3-4 minutes downtown.To get to and from the entrance to Salute to America, you should use the Federal Triangle or Smithsonian stations on the Orange, Blue and Silver lines. To avoid a transfer on the Red line, you can exit at Metro Center."Event officials and Metro staff will direct customers on the Mall to specific stations after the fireworks to help with crowd control," Metro said. "Metro Transit Police will be at station entrances to monitor crowd flow and may, at times, limit entry to prevent overcrowding."When are the military flyovers July 4 in Washington DC?Military flyovers and demonstrations will take place for seven hours along the National Mall and Washington Monument grounds today, with one more coming around the time fireworks begin.1:14 p.m. - NASA F-5 Flyover1:24 p.m. - NASA Fleet Review1:44 p.m. - USCG Helo Flyover1:54 p.m. - USCG Fixed Wing Flyover2:09 p.m. - Golden Knights, Leap Frogs2:29 p.m. - Army Helo Flyover2:44 p.m. - USAF Fleet Review - Wave 1 - Heavies2:54 p.m. - USAF Fleet Review - Wave 2 - AFSOC3:04 PM - USAF Fleet Review - Wave 3 - Fighters3:29 p.m. - Executive Rotary Wing Airlift3:39 p.m. - USMC Fleet Review - Wave 1 - Rotary3:49 p.m. - USMC Fleet Review - Wave 2 - Fixed Wing3:59 p.m. - USN Fleet Review - Wave 1 - Rotary4:09 p.m. - USN Fleet Review - Wave 2 - Fixed Wing4:19 p.m. - USN Fleet Review - Wave 3 - Fighters4:21 p.m. - USN F-18F Demonstration4:59 p.m. - USN Blue Angels5:26 p.m. - USMC MV-22 Osprey Demonstration5:44 p.m. - USAF Fleet Review – Fighters6:02 p.m. - USAF Tri-Bomber Formation6:05 p.m. - USN F-35C Demonstration6:25 p.m. - USAF Thunderbirds Demonstration7:03 p.m. - Air Force One Flyover7:07 p.m. - USAF Thunderbirds Delta Break7:17 p.m. - HUGE 1 Flyover Led by the Newly Renovated Air Force One7:38 p.m. - U.S. Stealth Airpower Flyover7:39 p.m. - F-22 Raptor Demo7:53 p.m. - F-22 Raptor in Afterburner7:59 p.m. - B-1 Flyover8:07 p.m. - B-1 in Afterburner8:11 p.m. - HUGE ONE Fly Over Review8:22 p.m. - Golden Knights Twilight Jump10:36 p.m. - B-1 Afterburner Night PassWhere else can you watch fireworks in Washington DC?Freedom 250 will have viewing spots for tonight's fireworks at Hains Point, Columbia Marina, RFK Stadium, Meridian Hill Park, Union Station, Lower Senate Park and Upper Senate Park.Other popular areas to watch the fireworks include the Cardozo Education Campus in Columbia Heights, the Washington National Cathedral in northwest DC and the steps of the U.S. Supreme Court Building on Capitol Hill.Washington DC officials have also released an interactive map that allows you to see your view of the fireworks from any place in the city.Where can you watch DC's fireworks from Virginia?Gravelly Point along the George Washington Memorial Parkway is known as one of the best spots in Virginia to watch DC's fireworks show.In Arlington, the U.S. Marine Corps War Memorial, the U.S. Air Force Memorial and Lady Bird Johnson Park are considered some of the top viewing spots.The show can also be viewed from parts of the 18-mile Mount Vernon Trail.The towns of Fairfax, Great Falls and Herndon will have their own fireworks shows.Where can you watch DC's fireworks from Maryland?The National Harbor has clear views of the Potomac River and is one of the most popular spots to watch DC's fireworks show from Maryland.There will also be fireworks shows nearby in Rockville and Frederick.