My kids have this "tradition," I suppose you can say, of choosing a child to honor for the day. The honored child gets to wear a crown and the other kids pretend to be their "servants" for the day. (*I* was never this noble when I was growing up. My siblings and I would make each other "slaves for a day/week" depending on what sort of deep, dark misdeeds we could hold over each others' heads... we would NEVER offer to be servants voluntarily!)
This was Marie's day. She seemed to really enjoy the extra attention!