Create a view of views?
Sounds like you just want a taxonomy term view. Then output the name field and and use the Rewrite Results, "Output this field as a link". You'll want to make the links for the other view predictable by using arguments like TID. Then you can set your link to use tokens like seminar/tid. I think you can use term name as well with a little bit of magic on the contextual filter.

If you just want to display all categories and seminars on the same page, create a view that outputs seminars and add the taxonomy term field. Then group by the term.