None of them are actually like C2 Event Sheet system.
C2 uses actual code in order of sequence as both it's visual and execution. C2 is a bridge between Visual Programing Language and code writing. Actually I personally feel that C2 could help teach programming as a first step because of how well it's designed.
All the ones you listed takes parts from Visual Programming Languages.
PlayMaker is a FlowChart design and heavily uses Finite State Machine(google it). C2 doesn't use FlowCharts as programming.
uScript starts with a FlowChart, but it's more like Function Flow Chart. The objects themselves still require code writing.
Anteres Universe is like a bridge between uScript and PlayMaker.
plyGame is Unity version of C2 behaviours. However this does offer Scratch like programming. But personally I don't like Scratch it's clunky.
PlayMaker and plygame is the only one where you don't have to write code.
so the result is not a single one does anything similar to what C2 does.