The initiative is called Northside and Eastside LOVE which stands for "lifting our various enterprises."
"No longer is it acceptable to say 'I did not see, I don't want to get involved,'" said Councilman Reggie Brown.
Brown was joined by clergy and community activists at Lonnie Miller Park.
On Sunday, the park was littered with trash that took city crews hours to pick up on Monday.
Brown said several thousand people converged on the park, creating a mess with it taking police hours to remove the crowd.
On Tuesday morning, 17-year-old Errin Alexander Brooks was found dead outside a home on Clyde Drive. Students on their way to school found the teen's body. Neighbors reported hearing gunfire the night before. The Jacksonville Sheriff's Office says the death is still under investigation.
The community call to action will kickoff on May 17 with people asked to clean up parks and their neighbors to show they care.