google calendar synced to epics calendar duplicate events!?

[StoneRyno]

This may be one of those things where I'm not using the right search terms to find a solution so hopefully this is not a repeat question/thread. I used both titanium backup and mybackup to backup my epic before changing from stock rooted EC05 (the odin prerooted method) to ext4 syndicateROM 1.1. I wasn't thinking about it but I restored event data with the caledar settings. I probably should have checked before performing that restore. This resulted in duplicating everything on my google calendar. This wouldn't be a problem except that part of my google calendar is a public holiday calendar. Restoring the event data duplicated the public holiday calendar to my personal google calendar so all holidays are seen twice. Is there any way I can purge the duplicates from my personal calendar without having to write down all my other events and delete my personal calendar and recreate it?