One reason for this is how people learn in different ways. It is interesting to see students grasp a concept from someone else because that instructor simply worded it a different way. When they heard the idea presented in that fashion, it clicked with them.

You can also bring various stylists as well: they don't have to be from your own style. If you know what styles are out there then you will know how to better defend against them. You can bring in a Tai Chi instructor, or a Kung Fu stylist to teach some of their systems basic principles. You can also bring in a Kali stylist as well.

People who are there to teach do excellent seminars and most instructors just need to be contacted before they will negotiate on costs. If they are decent people, they will explain their system and try to incorporate that knowledge back into the style of arts the audience knows. If someone is teaching joint locks of Wing Chun, they can easily incorporate those back into Kenpo; joints bend and lock the same way no matter what style you learn. You can often set the topic or ask them for their usual topics.

But do not think an invited instructor is there to steal your students. If you fear such a thing, contact others he has done seminars for. Also do not think that by having seminars you are lessening your own place in the school as the instructor. When you do invite a guest instructor, you are telling your students that you need to learn as well and that everyone is a student no matter how much they appear to know.

In Kenpo, you will run into these names common on the seminar circuit: Richard "Huk" Planas, Sean Kelley, Dave Hebler, Frank Trejo, Larry Tatum, and many others. If you can get to seminar, I would strongly recommend it. It brings the Kenpo community together and exposes your students to some new ideas.

And the best is when they say "Hey, (our teacher) has said that!"