Completely remove Facebook Importer
Hey there, Hunter!
You could try wiping the the database manually in PHP MyAdmin or by using a database management plugin, like WP-DBManager. I do want to point out that we don’t support that plugin and to use it with caution.
You could also try exporting the event data from WordPress (Tools > Export), then working with a clean install of the plugin. That might be worth a try before wiping anything from the database.
If you’d like to work from scratch, you could use the Event Rocket plugin (again, not supported). However you will definitely want to create a backup of your database since this will completely wipe it clean. Definitely a drastic measure, so tread with caution.
Does that make sense? Will that work for you? Please let me know.