Rebecka,
This sounds like a neat opportunity for you

Congratulations!
I'm a little uncertain as to why you discounted your rates so heavily (one fourth of your normal rate?? - if you're only charging for one hour when it could take four...) I do hope you'll charge more for subsequent series! Your time and skills are valuable!
BUT - I would put together a small welcome or intro packet for each of these people you'll meet with, maybe create a 'coupon' and let them know that if they or anyone they refer to you wishes to start working with you you'll offer them X% off or something. (Assuming the people running the program don't have a problem with your doing so)
Include a handful of business cards, and the usual info.
These clients sound like fun and very creative people - it's always nice to be working with people who have a lot going on, you're exposed to that much more opportunity of your own.
I hope you have fun, it sure sounds like a neat event!