Paul Toner announced Tuesday that he is seeking a City Council seat, following up a run in 2017 when he was the final challenger eliminated in 19 rounds of ranked ballot counts.

The first City Council challenger new to the political scene has declared officially for the Nov. 2 municipal elections: data scientist Dana Bullister.

Three city councillors announced their intentions to run for reelection this week: first-termer Jivan Sobrinho-Wheeler on Wednesday, vice mayor Alanna Mallon on Thursday and Quinton Zondervan on Friday.

The upcoming City Council elections got their second announced challenger Tuesday in Nicola Williams, and the second coming from Cambridge’s small-business community.

Councillor Marc McGovern announced his reelection campaign Monday, asking voters to return him to office to continue work on priorities including affordable housing, homelessness, income and food insecurity, and climate change.

Joe Curtatone, 54, has been mayor since 2004, making him the city’s longest-serving mayor.

Theodora Skeadas, director of the small-business advocacy group Cambridge Local First, announced her candidacy for City Council on Friday with a list of priorities that is topped by economic challenges, followed by housing and racial justice issues.

A small group of Sunrise Movement Boston activists say they plan to gather Saturday to livestream a protest urging support for State House transparency amendments.

A fairly rote resolution of thanks to the speaker of the Massachusetts House of Representatives for years of service went a surprising direction Monday, with only one-third of Cambridge city councillors voting yes.

A general town hall forum with five city councillors is scheduled for 5:30 to 7:30 p.m. Wednesday, when residents can ask questions about whatever is on their mind and hear about conversations happening at the council level.