Party (on the stairs)

What will they think of next. They decided they were going to have a party.... but on the stairs. They love it. They get their blankets, pillows, dolls, books, drinks, snacks, and sometimes the portable DVD player and sit and have a party on the stairs. At first I was like, NO WAY girls you have a toy room for this exact reason, but no mom, this is much more interesting. So an hour later.... a day later.... the party is still set up on the stairs. The dogs don't like the clutter coming down the stairs, they don't know where to walk. It is definitely an "imagination" thing for them.