That is likely an issue if not the issue, especially if other mods were installed and later removed. Removing mods is a source of some of the more debilitating issues for any game, as the reference data in the save files now points to nothing.
If the Events mod is necessary to even get the game to load, then the only option you'll have for that save is to rebuild exactly the same mod library you were using the last time it was saved (ensuring every mod is updated for the version of the game you have installed now) and then try loading it again.
Personally, I would write that playthrough off, though. It's likely possible to get it working again, but it's unlikely to be worth the time required to figure it out. My suggestion is a clean installation of the game and a new playthrough.
If you do want to try to get the old one working, be sure to back up a copy of that save file in a place where it will not be deleted or saved over. Even if it loads, eventually, there may be other issues that can compound what you're seeing now. Always be able to roll back to that save file in its present state.