I do two things:
(1) As soon after the seminar as I can, I visualize the whole thing and write everything down in a notebook. Depending on the instructor, some let you take videos of you performing things with your partner, or allow you to take written notes during. I find I don’t have time for that during the seminar, hence why I write stuff down after.
(2) I try to take at least one specific detail and add that to my game. Sometimes I can add two or three, but often it is one thing that stands out.
Extra Credit...Make sure you get a pic with Boogey, hehe