I’m sorry if I have discouraged you. In fact, experience with synchronization via csv is most welcome here.
However, adding new events via csv isn’t a problem, is it?
Are there any special advantages in creating the events with Obsidian? It is much easier the other way around, because I have programmed a tool that can generate Obsidian pages with all relationships and metadata from an Aeon Timeline project. See this post:
This works completely without the detour via csv. Unfortunately, the file format of Aeon Timeline 3 is such that you can read it with third-party software, but not write it straight away.