Hi and welcome back 🙂
The only way at this time to “re-synchronize” events at this time is to set up a scheduled import to run daily. If you visit Events > Import > New Import and select Facebook from the dropdown. From there, you can set up your daily scheduled import. (see screenshot below for example)
You’ll need to visit Events > Settings > Imports and make sure things are set to your liking. If you’d like to request additional features, you can do so by visiting our UserVoice Feature Ideas page.
I hope this helps answer your question and please let me know if you have any additional questions or comments. Cheers!