For the second time in as many weeks, one of Miami’s neighboring municipalities is threatening to sue the city over plans to develop its valuable waterfront properties that lie along crucial county causeways.

The Key Biscayne Village Council voted late Tuesday to file a lawsuit against the city of Miami over a project in the works to rehabilitate the historic Miami Marine Stadium and redevelop the surrounding area. Village officials worry that a planned $16 million outdoor event space on the stadium grounds will be used to host dozens of Rickenbacker Causeway-clogging events, like the Miami International Boat Show, which is moving to the site in 2016.

The village will file a suit next week and then immediately stay the proceedings and enter into mediation, according to Village Attorney Stephen Helfman. Village officials say they’ve tried…