This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

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.