San Francisco is set to consider a bill that would make it illegal to carry a concealed weapon at events with more than 50 people.

Supervisor Catherine Stefani told the San Francisco Examiner that she will introduce a measure banning concealed weapons within a 500-foot radius of large events. Open carry is not allowed in California, but residents can apply for concealed-carry permits.

Stefani said that she was motivated to introduce the bill after concerns about violence breaking out at events were raised over a planned far-right rally in San Francisco last year.

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The organizers of the rally canceled the event over safety concerns.

Stefani told the Examiner that she didn’t know of any instances of violence at events in San Francisco that involved concealed weapons, but she still has concerns about the future.

“Concealed carry and guns have caused enough damage in this country altogether,” she said.

The measure comes as Congress debates the Concealed Carry Reciprocity Act, which would allow those with concealed-carry permits from their home state to use them in other states. The House passed the bill in December.

Gun control efforts have been stymied in Congress despite a rash of mass shootings in recent years. The concealed-carry reciprocity bill was passed two months after the largest mass shooting in modern U.S. history in Las Vegas left 58 people dead.