Authorities across Long Island held events Tuesday to improve relationships between police and the communities they serve. 

National Night Out is observed annually on the first Tuesday of August. This year it took on even more importance in the aftermath of two mass shootings that left 31 people dead.

Nassau law enforcement officials reminded people to say something if they see something.

"If you're concerned about something, let somebody know," says Nassau District Attorney Madeline Singas. "The greatest danger for us in law enforcement is that information stays silent."

The annual initiative, which is now in its 36th year, also helps to inform people about community efforts like drug prevention campaigns and neighborhood watch programs.

Some Long Island parents also signed their children up for Operation Safe Child, an ID card program that helps track down a child who goes missing.

Residents also were able to meet police officers and first responders who work in their neighborhood.

"Because a lot of people are afraid," said Michelle Ramirez of Uniondale. "They think, you know, they think it's for being scared about the police. No, they're part of the community. You know, I think they help us."

There were dozens of National Night Out gatherings across Long Island. An estimated 38 million people participated in National Night Out events nationwide.