Ald. Derrick Curtis (18) advertised a campaign kickoff event he hosted for Mayor Lori Lightfoot in his June 2 ward newsletter. [18th Ward]

Ald. Derrick Curtis (18) could be on the hook for at least a $5,000 fine over an apparent violation of city ethics rules surrounding a campaign kickoff event he hosted for Mayor Lori Lightfoot last week, the Chicago Board of Ethics ruled on Monday.

The ethics board also opted to give Ald. Nicholas Sposato (38) a chance to escape a similar fine for mixing political and government messaging. And board leaders called on the mayor and City Council to put the gas on a proposed amendment to the city’s ethics ordinance that has been stuck in legislative purgatory since April.