The "Blackout" march began at 7 p.m. as hundreds walked around City Hall and headed to the statue of former Philadelphia mayor Frank Rizzo.
David Ramirez-Martinez, 45, was charged with first-degree murder in the death of a 39-year-old woman in Chicago on May 14, 1994.
A man allegedly walked into the fenced yard of the family's home and asked the 4-year-old for her name. He then grabbed her and tried to leave.
Riverdale police found 23-year-old Brian Chellis passed out in a car early Friday morning wearing an Elf on the Shelf costume.