I'm finding it is tricky to get students started using Class Notebook.
I am thinking that part of this is that we are asking them to work in a new way, with a new tool and then sometimes creating many varied and at times challenging activities.
This activity is a gentle lead in to the use of this tool.
I'm not saying you should use this activity - but the general technique of a low barrier to entry that is accessible but linked to your subject matter may be appropriate.
It's just an idea - please do share your own ideas back with me on m.chesterman@mmu.ac.uk