Hi Long!
First off, sorry but I guess I should have said "FAQs" not "Events" ~
Sure:
Categories in Notices:
https://tinyurl.com/26nlegkq
Categories in FAQs (which are right and were made first):
https://tinyurl.com/22epcm4f
They're in Korean, but you'll notice they're the same.
I didn't create a custom Category for either of them. I just made the categories in FAQs. Here's our custom taxonomies - and they all apply to "Products":
https://tinyurl.com/2bjsjzr4
Any other screenshots that would be helpful?