Would it make sense to create a sticky named "Seminars and Workshops?"
If you're aware of one, hosting one, etc., you can post your date, time, fees, agenda, etc., there and there only.
Those of us who don't attend workshops can skip reading it.
Those of us who do can always see what's going on in what areas.
My only concern with my own suggestion is how to control useful conversations that stem off an individual seminar or workshop. Ideally, people would create a separate thread to follow--but generall we PracTacers can't do that in regular threads that go way off topic.