Forget about having your child just ring a friend on the telephone and ask them to come over. How about making the invite itself into an activity? Bay Area Mom did just that.
What a clever idea. She creates the basic text and lets her son add the pictures and sign his name.
"Of course, at this stage I guide his hand on 70-80% of this task. Still, both he and the kid he gives the invitation to get very excited and form a closer bond just by the simple act of such a formal invitation."
Thanks Bay Area Mom!