Show specific categories in the legend based on template or other condition

Hey there,

Is there a way to show only certain categories or sub-categories based on the page template?

Basically I have events that are seminars, courses, and networking.

Courses might have multiple sub-categories.

If I wanted to show a mini calendar on the Courses page that only shows the courses with a legend of the sub-categories of the courses, is there a way to do that?