The featured speakers will be Roswell Mayor Jere Wood and State Sen. John Albers, along with other dignitaries.
The event is free and is open to the public. The City Hall address is 38 Hill Street.
Before that, students at Roswell High School will be having a ceremony that starts at 7:30 a.m., and they also have invited Sen. Albers to speak.
Members of the current Roswell High senior class -- who were in kindergarten on Sept. 11, 2001 -- will be placing 2,977 American flags on the school's front lawn. That represents the number of victims who died in the three separate airplane attacks in New York, the Pentagon, and Pennsylvania.
The students also will be fundraising to benefit first responders with the Roswell police and fire departments, according to senior Madeleine Nolte.
"We are the last group of students that were in school on that fateful day," she said. "I would like for our class to be the first class to start a tradition of Roswell High School honoring this moment in history.
"It is important to me that all students at Roswell never forget the significance of this historical day."