Hi Laurie,
Thanks for reaching out and for you interest in iCal importer!
When you re-import a feed the existing Event data will be overwritten with the updated event data (dates, description, etc). Additional data (like image or taxonomies) will be retained, also when importing you have the ability to set a category for the imported events.
I think the best in this cases is to try out the product with your data sets. This is the only way you’ll know for sure if our product works for you. We have a 30 day refund policy so you can buy the product and test your workflow – in case it doesn’t fit your needs you can ask for the refund.
Please let me know if this answers your question,
Best,
Nico