He said he is grateful for the many agencies working daily to protect children and for the volunteers who make CASA run.
"So much can be done once the information is brought to the attention of the courts," he said. "It only happens when the community steps up."
The Bel Air Lions Club showed its support by donating $500 to CASA, Lions Club member John A. Verbillis said.
"We are always looking for worthy community causes," he said, adding his wife is with CASA and his family has been active in foster care.
Sharon Lipford, deputy director of the county's community services department, presented a proclamation to DiEdoardo on behalf of the county.
The Susquehanna Singers performed several songs, including "You Are the New Day" and "Song of Peace (Finlandia)," as those in attendance stood briefly with lit candles as night fell.
DiEdoardo said he was "overwhelmed" by the response to the first event and attendees seemed pleased.
Bel Air's Abigail Allan and Samantha Villamagna, both 16 years old and "best friends," said they believe in the idea of the vigil.
"I just wanted to support it because I know some people who have been abused," Samantha said. "I think it's a good thing to address to the public."
Abigail, whose mother works with CASA, added she wanted to "be that person" who gives a voice to those who do not have one.