Community members pray at a tribute to shooting victims along Shady Avenue in Pittsburgh, Pennsylvania on Tuesday morning. Oct. 30, 2018

Memorials, fundraising efforts, and vigils are just a few of the ways that communities across the world are showing solidarity with Pittsburgh in the wake of a massacre inside the Tree of Life Synagogue.

The American Jewish Committee has another idea: #ShowUpForShabbat.

“AJC is calling on Jewish communities across the country — along with elected officials, religious and civic leaders, and other allies, both Jewish and non-Jewish — to flock to synagogues this coming Shabbat,” states a message from the group.

Shabbat begins each week at sundown Friday and ends Saturday at nightfall, and services can take place on both days.

“When something like this happens, people of good will want to do something,” Marcia Bronstein, regional director of AJC Philadelphia/Southern New Jersey, told Billy Penn. “We decided if synagogues could open their doors to community members, religious leaders, diplomats, city council people, and members of different churches and faith groups, it would be a way for people to come together and for some healing to take place.”

Last Saturday, a gunman killed 11 people worshipping inside the Tree of Life Synagogue in Squirrel Hill. The suspect, Robert Bowers, expressed hatred toward Jews after being taken into custody.

Just hours after the massacre, hundreds of people gathered near Tree of Life to remember the victims. The following evening, members of several faith communities joined elected officials to mourn.

“Any attack on any religious group is an attack on everybody,” Bronstein said. “Anti-Semitism is an illness, it’s a cancer, and nobody has a monopoly on hate. Tragically, we see that all too often in our society.”

Bronstein said AJC has been connecting community members who want to show solidarity with synagogues that will welcome them. That includes a diplomat from the Netherlands who will attend services in central Pennsylvania.

Because of security concerns, AJC is not publishing a list of synagogues participating in #ShowUpForShabbat. People interested in joining can call their nearest regional office for assistance. Bronstein added that AJC has contacted law enforcement to ensure the safety of people who want to come out and worship.

The hashtag #ShowUpForShabbat “has created a lot of traction on social media,” Bronstein said. “We’re hearing from so many people that they’re going to come out.”

Sarah Anne Hughes is based in Harrisburg for The Incline and Billy Penn as the sites’ first-ever state capitol reporter and is a 2018 corps member for Report for America, a new initiative that seeks...