In my efforts to eliminate worksheets and as a result of some of the awesome ideas I got from the teacher's institute I went to last weekend, I am struck by a simple truth:
If a student can miss class and get the worksheets later on, there is little incentive to come to class.
If a student comes class and misses an experience that can't be duplicated, then there is a lot more reason to make an effort to show up.
Of course, this awareness isn't going to be automatic. Students don't have any way of knowing now that there are a lot more experiences to be had in class. But I think that they will figure it out pretty quickly.