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CHICAGO — It’s a busy weekend for Chicago as the city and surrounding suburbs join the rest of the country in remembering the 20th anniversary of Sept. 11.
At 7:30 a.m. Saturday, a memorial ceremony is being held at Daley Plaza to remember the lives lost in the terrorist attacks. The ceremony will be followed by the Memorial 9/11 Stair Climb at Soldier Field at 8 a.m.
The City of Aurora is honoring six firefighters who traveled To New York to help with rescue and recovery efforts in the aftermath of attacks.
Terrorism analyst Tom Mockaitis explained how the fight against terrorism and U.S. security tactics have changed throughout the years since 9/11.
394261 22: Civilians flee the area as a tower of the World Trade Center collapses September 11, 2001 in New York City after two airplanes slammed into the twin towers in an alleged terrorist attack. (Photo by Spencer Platt/Getty Images) 
394261 19: People rush away from the collapsing World Trade Center September 11, 2001 after two hijacked airplanes ran into the two towers in New York City. (Photo by Spencer Platt/Getty Images) 
394261 111: People walk in the street in the area where the World Trade Center buildings collapsed September 11, 2001 after two airplanes slammed into the twin towers in a suspected terrorist attack. (Photo by Mario Tama/Getty Images) 
394261 30: Spectators look up as the World Trade Center goes up in flames September 11, 2001 in New York City after two airplanes slammed into the twin towers in an alleged terrorist attack. (Photo by Spencer Platt/Getty Images) 
394263 12: (PUERTO RICO OUT) Firefighters walk towards one of the tower at the World Trade Center before it collapsed after a plane hit the building September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images) 
NEW YORK – SEPTEMBER 11, 2001: (SEPTEMBER 11 RETROSPECTIVE) Smoke pours from the twin towers of the World Trade Center after they were hit by two hijacked airliners in a terrorist attack September 11, 2001 in New York City. (Photo by Robert Giroux/Getty Images) 
NEW YORK – SEPTEMBER 11: Firefighter Gerard McGibbon, of Engine 283 in Brownsville, Brooklyn, prays after the World Trade Center buildings collapsed September 11, 2001 after two hijacked airplanes slammed into the twin towers in a terrorist attack that killed some 3,000 people. (Photo by Mario Tama/Getty Images) 
NEW YORK – SEPTEMBER 11, 2001: (PUERTO RICO OUT) (SEPTEMBER 11 RETROSPECTIVE) People run away as the North Tower of World Trade Center collapses after a hijacked airliner hit the building September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images) 
NEW YORK – SEPTEMBER 11: An unidentified New York City firefighter walks away from Ground Zero after the collapse of the Twin Towers September 11, 2001 in New York City. The World Trade Center’s Twin Towers and the Pentagon were attacked by terrorists using commercial airliners as missiles. (Photo by Anthony Correia/Getty Images) 
Pedestrians make their way through the dust of lower Manhattan 11 September 2001 in New York after two hijacked planes flew into the World Trade Center. AFP PHOTO/DOUG KANTER (Photo credit should read DOUG KANTER/AFP via Getty Images) 
394263 08: (PUERTO RICO OUT/GERMANY OUT) A survivor sits outside the World Trade Center after two planes hit the building September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images) 
NEW YORK – SEPTEMBER 11: Hijacked United Airlines Flight 175 from Boston crashes into the south tower of the World Trade Center and explodes at 9:03 a.m. on September 11, 2001 in New York City. The crash of two airliners hijacked by terrorists loyal to al Qaeda leader Osama bin Laden and subsequent collapse of the twin towers killed some 2,800 people. (Photo by Spencer Platt/Getty Images) 
NEW YORK, UNITED STATES: Smoke rises from the New York skyline 11 September 2001 after two hijacked planes crashed into the landmark World Trade Center. US military forces worldwide were on their highest state of alert after the attacks against the World Trade Center and Pentagon, Pentagon officials said. AFP PHOTO/JOHN MOTTERN (Photo credit should read JOHN MOTTERN/AFP via Getty Images) 
Smoke billows up from the ground after one of the towers of the twin towers of the World Trade Center towers collapsed 11 September, 2001 in New York. AFP PHOTO Henny Ray ABRAMS (Photo credit should read HENNY RAY ABRAMS/AFP via Getty Images) 
(FILES) Photo dated 11 September 2001 shows pedestrians on the waterfront in Brooklyn, New York, looking across the East River to the burning World Trade Center towers. The fifth anniversary of September 11 finds the United States bloodied by foreign war, polarized politically and coping with terrorism’s curbs on freedom which helped define American life. AFP PHOTO/FILES/Henny Ray ABRAMS **MORE PICTURES AVAILABLE ON WWW.IMAGEFORUM2.AFP.COM** (Photo credit should read HENNY RAY ABRAMS/AFP via Getty Images) 
Firefighters search through the rubble of the twin towers at the World Trade Center in lower Manhattan 11 September, 2001, in New York after two planes flew into the buildings. A New York city firefighters’ union reported that 200 firefighters died in the collapse. AFP PHOTO Doug KANTER (Photo credit should read DOUG KANTER/AFP via Getty Images)
