Mayors Against Illegal Guns
Everytown for Gun Safety is an American nonprofit organization which advocates for gun control. Everytown was founded in 2014, combining Mayors Against Illegal Guns and Moms Demand Action for Gun Sense in America. Wikipedia*
On the C-SPAN Networks:
Mayors Against Illegal Guns has hosted 1 event in the C-SPAN Video Library; the first program was a 2008 Forum.