School Board Member Jeff M. Bourne, who was listed by organizers as attending, said he was uncertain if he would participate because he hasn’t yet decided whether to run for mayor.

“If I decide to run, then I would likely attend,” he said. “I expect to make a decision in the next week or so.”

Only one likely candidate said he won’t attend: Levar Stoney, who serves in Gov. Terry McAuliffe’s cabinet as secretary of the commonwealth. In a text message, he said attending the forum “would be premature.”

“I am fully focused on serving the people of Virginia in the job I have and will make a decision about a campaign for mayor at a later date,” he said.

Of attendees, only Mosby and Estes have filed paperwork confirming their intentions to seek the office, while Tatnall and Ingold have both said definitively they intend to run. The remaining potential candidates have been noncommittal, saying they will make announcements in the coming months.

The event is organized jointly between the Wilder School of Government and Public Affairs at Virginia Commonwealth University and Virginia Union University. It will take place on April 6 in VUU’s Coburn Hall at 7 p.m.