Here are a collection of cctivities for children to learn about Hajj:
3D Hajj learning kit: https://www.etsy.com/ca/listing/203090280/3d-hajj-islamic-learning-kit-eid?ref=shop_home_active_3
Activities E-book: http://www.islamfromthestart.com/2014/09/hajj-activities-ebook.html
Hajj Activity Pack: https://learningroots.leadpages.co/hajj-ac/
Craft Ideas: http://modestmunchies.com/29-ideas-hajj-home-kids/
This has a good round up of all you can do: http://themuslimahmommy.com/10-different-ways-to-teach-children-about-eid-al-adha/