There was a thread on this a while back that you can find
here, it touched on the service hour requirement and other misc. requirements.
When I was a pledge we met every other week, right before the active meeting. (which we could stay for) At the meetings we took quizzes on material (it was in our pledge manual...we were told each week what would be on the next quiz and we just read it on our own), did some icebreakers, planned the pledge project, etc. I don't remember exactly since it was almost 11 years ago!
What was your last pledge program like, if I may ask?