Allow switching of categories in a topic

True enough, but nav normally doesn’t go under those buttons.
Perhaps I use categories more that average? for example on this site I frequently flip between feature, ux and bug to ensure I’m putting things in the right place.
On my discourse, I use categories (and subcategories) to switch between events (it’s a message board for festivals). So I want to make the nav between these contexts as friction free as possible.
Considering that we stick the current category to the top nav bar on the left, putting a pulldown control here instead would seem to make sense? You could even display the number of unread topics in these categories?

I had a look at other forums, and I didn’t find any that provided easy access to switch between categories. That doesn’t necessarily make it a good thing though!
Do other people not switch between categories very often? Interested to find out if I am unique in navigating around like this?