Congrats on hosting a clan tent. I do as well, and it is a rather rewarding experience!! It seems you have all the bases covered and the recommendations that James gave you are spot on.
I just have one suggestion: Last year when I was at the Glengarry Highland games, I noticed that a clan table a few feet away had a battle axe and sword. I thought that it was a little over the top until I noticed that they brought them so children that were dragged there by their parents could look at them and have their picture taken with them. The kids loved it!! (Of course the blades were not sharp and it was well supervised.)
While I don't have a weapon for the kids to pose with, I thought it was a great idea to have something for kids at my booth. I might track down a few colouring pages and have a few little books made up for the kids who stop by. You never know, you might spark a child’s interest in their history!
Most of all have fun,
Sara