Once we've shared the concept of the narrative arc, your kids will design words from Word Market purchases, step into the illustrator's shoes, dine on Dictionopolis banquet (and prison) fare like Milo did, define idioms through images, translate music into color in a twist on Chroma's talents, collect and label Dr. Dischord's lab specimens, face the Dodecahedron 12 times, and make fun puns out of homophones, like Norton Juster did. And when they get back, there'll be a travel sticker waiting for them, proving they've been to the Lands Beyond.
This workshop video (42m) includes pauses for activities, so it can easily provide at least three hours of fun, hands-on learning.