The American Civil Liberties Union of Massachusetts and the National Lawyers Guild’s Massachusetts chapter will host a “Copwatch training” event in Roxbury this afternoon, aimed at clarifying exactly what Boston residents’ rights are when it comes to filming the police.

“For many years people in Boston have been allowed to videotape police officers, but many officers either forget or want to forget that this is the law and sometimes they confiscate phones or cameras or recording devices claiming that people aren’t allowed to do it. We just want to make sure that everyone who participates in the program understands the law and understands their rights,” said Urszula Masny-Latos, executive director of the National Lawyers Guild’s Bay State chapter.

“We want everyone in the community to understand that even if a police officer says you’re not allowed to film them and you’re breaking the law that actually they are not.”

According to event listing on the ACLU website, the seminar is meant to help Boston residents “learn how to monitor, record and combat police brutality and misconduct” and will offer “skills to empower individuals and communities to resist abusive and white supremacist police tactics.”

More than 100 people are expected to attend, according to the event’s Facebook page.

“Our part of this event is going to be to talk about people’s rights to video what the police do in public, which is something that we’ve been working on for years,” ACLU spokesman Chris Ott said.

The event, scheduled to run from 1 to 5 p.m. at the First Church of Roxbury, will feature separate workshops on “Know Your Rights training,” “CopWatch training” and “Legal observer training,” according to the post on the ACLU website.

The event comes after a Boston police sergeant earlier this month was forced to apologize to a 61-year-old man he confronted for videotaping officers as they detained a teenager — an incident that prompted an internal investigation into apparent intimidation. Police say all officers were reminded citizens can legally videotape them.

Masny-Latos said it is imperative that Hub residents know how to “properly interact with the police.”

“With these trainings,” she said, “we just try to be sure that people understand that they do have rights when they interact with police officers.”