Hey Joshua,
Sorry you’ve run into trouble here – the plugin does already have this functionality, and you should be able to map the “Event Category” import field to whichever column in your CSV import file has the category/categories.
Here’s a screenshot for reference → https://cloudup.com/c3_IYGZDgh8
Is that not working for you? If so, what is happening specifically? Also, if possible, it would be quite helpful if you shared the .csv file you’re trying to import – you can upload to a site like http://ge.tt or Dropbox, and we’ll download it from there if you share it.
Thanks!
George