Here's the easy-to-make puppet theater I promised.
3 tension rods (one for each level of fabric) - measure your door width to buy the proper size
fabric for the bottom skirt and top valance (I used two widths sewn together for those to get a nice amount of gathers) - all length measurements are up to you based on how tall you want the theater to be when finished
fabric for the stage curtains ( I used one length split in half for this to make it easier for the curtains to stay open.)
a few drapery weights (These were sewn to the bottom corners of the skirt to give it some weight so that it would hang nicely.)
All you have to do is sew hems and casings on your fabric. Because I used a solid color fabric for the skirt and valance I was able to use the fabric's selvage as a finished edge. Put the tension rods through the casings and hang them in a doorway.
I'm unable to tell you how to stop your kids from racing through the skirt like lunatics. Apparently that's even more fun than putting on a puppet show.