For the wedding at Canna, maybe you could write the lesson to be a "story in a bag" kind of thing. A copy of each element that you place in the bag could be given to the kids to scrapbook with. Maybe an antique-y looking wedding invitation, a portion of a map highlighting Galilee, die cuts of jars, watery stickers, etc. If you want to incorporate journaling into the scrapbook page, have them write as if they were a guest... what they saw, when they met Jesus, etc.
I like the idea of "Scrapbook Sunday" as a review/keepsake activity, too.
Let us know how this turns out!
Cheryl