Organizers say, 96 people are killed by guns every day.
MORE: 12 crosses placed outside nightclub to honor Thousand Oaks victims
The display included 20 pairs of shoes belonging to the children killed in the Sandy Hook Elementary School shooting six years ago.
"Each shoe has a story of that person and the life they could have led and what we miss out when we lose someone so quickly to gun violence," said Suzanne Verge, president of the L.A. chapter of the Brady Campaign to Prevent Gun Violence.
During the interfaith service at the church, organizers read the names of the Thousand Oaks massacre victims and issued a call to action to stop the cycle of gun violence.