I’ve been on a few, lots of one-day in-house when I worked for a big company, then a development programme which was the same group of people who met regularly to work through modules and a project.
Some stick in my mind as useful. One on “dealing with difficult people and giving feedback constructively” was a total goldmine, I still employ the advice. Thats the stuff you need to learn.
Another one where we had to pretend we were all stuck in the desert after a plane crash etc was fun but in the end I thought pointless. I mean, I wouldn’t really kill everyone and eat them.
Anyway, sounds like you need a clearer idea of what you want to achieve ??