Tuesday night was the first of three boat parties this week in Marathon. It will be followed by an MTOA get-together on Wednesday night (same spot as tonight – on the docks at Sombrero Dockside Marina) and a Looper Sunset Celebration at Banana Bay Marina on Sunday night. The 1 Palm Tree Ct. gathering (a private event – by invitation only) is held weekly by several of the boats docked close to the restaurant at the marina. Every year they put together a "boater's lounge," so to speak, right on the dock under a sad-looking, half-dead palm tree. They bring…