What would John Dog do?

I have been invited by the education co-ordinator at the musuem to conduct a hands-on seminar in small collage for twenty people at a (winter) Holiday event. I have mixed feelings about this, because while it is an honor and a chance for "face time", there is no stipend and the offer has been extended to several artists in an effort to provide hands-on activities for the fund raising event. If my seminar is well recieved, it may lead to a more featured, paid attraction. It looks as if there might actually be some considerable outlay for materials. I've got a few days to think about it.