By Russ Britt, MarketWatch LOS ANGELES (MarketWatch) — Across the U.S. and throughout the world, observances will take on a wide array of shapes and sizes when it comes time Sunday to commemorate those who lost their lives in the Sept. 11, 2001, terror attacks. From paratroopers dropping onto the field during halftime at the Jacksonville Jaguars’ EverBank Field in Florida, to a balloon release and potluck dinner in California, widely varying ceremonies will mark the 10th anniversary on Sunday of the terrorist attacks that shook America. While seems to be little rhyme to the ceremonies, many would agree there are plenty of good reasons to commemorate the day. Whether it be a concert or a religious service, the order of the day on Sunday appears to be remember — in any way possible — the nearly 3,000 people who lost their lives when terrorists commandeered four passenger jets and launched the deadliest attack on U.S. soil since the Civil War. Many eyes will be on New York and the dedication of the new 9/11 Memorial at Ground Zero, where the World Trade Center’s twin towers were destroyed by two of the hijacked planes. Ten years in the making, two square reflecting pools will occupy the same footprints where the fallen towers were erected during the late 1960s and early 1970s. President Barack Obama and former President George W. Bush are expected to attend the ceremony, with Obama speaking. The facility eventually will feature a museum, scheduled for completion next year, and a series of office towers around the site, the largest of which is a 1,776-foot “Freedom Tower.” Reuters On Sunday, national and New York City leaders will mark the 10-year anniversary of the attacks of Sep.11, 2001 with a ceremony unveiling a memorial and museum. This is a view of the North Pool at the World Trade Center construction site. The redesigned World Trade Center area was a long time in the making. A selection process took several years, and lining up funding took even longer, hampered by the 2008 financial crisis. But now the reflecting pools and tree-lined plaza have been completed, and the Freedom Tower is rising over the complex. The entire project is scheduled for completion by 2020. After that ceremony, Obama is scheduled to visit the site near Shanksville, Pa., where passengers of United Air Lines Flight 93 overpowered the four hijackers who had commandeered their plane and planned to fly it into an unknown target, perhaps the U.S. Capitol in Washington, D.C. The passengers forced the crash landing of the plane in a field just outside Shanksville. Finally, Obama is set to return to Washington for a ceremony at the Pentagon, where the fourth plane hit a wing of the U.S. military’s nerve center. Obama is expected to give a speech to the nation during a service at the Kennedy Center that night, a service that was moved from the National Cathedral, which was damaged in the recent earthquake that shook the nation’s capital. Since the 10th anniversary of the attacks falls on a Sunday, 13 National Football League games around the country are expected to feature dedications to the victims of the attacks. In addition to the paratroopers dropping in for the Jaguars game against the Tennessee Titans in Jacksonville, ceremonies throughout the league are planned. In New York Sunday night, actor Robert DeNiro will appear at the Jets game to narrate a tribute to family members of 9/11 victims, and Mary J. Blige will sing the national anthem for the team’s nationally televised faceoff against the Dallas Cowboys. And New York’s other team, the Giants, will be in the other city directly hit by the attacks, Washington, to face the Redskins. Former Secretary of State Colin Powell is expected to serve as the honorary captain of the Redskins. Russ Britt is the Los Angeles bureau chief for MarketWatch.