There are resources available online which will allow you to convert an Excel (.csv) file to iCal format (which is what Confluence looks for).
The important part is making sure that your excel spreadsheet matches the format expected by the iCal format.
If you don't mind running your data through a 3rd party site, you can use this one to carry out the conversion. Note: I'm not affiliated with, or sponsored by this website.
Be aware - this method appears to only work when creating a brand new calendar from scratch. I have tested the approach in the website link, and it does appear to work well.
Hope this helps.
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