Canton is the longest drive on this list, which is exactly why full days work best. Nine summer themes, each a complete week, each afternoon ending with a finished project.
Canton has plenty of summer programming close to home, so a trip east has to earn itself. The Friendship Factory of Dearborn does that with full days built entirely around making things, rather than an hour of craft inside a longer schedule.
Parents search for summer camps near Canton, full day art and craft camps, slime and tie-dye weeks, and creative summer programs for 5 to 12 year olds worth travelling for. Weeks run across the season and suit Plymouth-Canton families booking blocks rather than single days.

Nine complete weeks, none overlapping. Canton families almost always book consecutive weeks rather than scattered ones, and siblings can share a group.
Very little to send. Everything the projects need is already here.
No supply list at all. The weekly rate covers it.