Two free tickets per family for admission on September 24th see details and museum list here: http://slickdeals.net/?sdtid=308777...tp://www.smithsonianmag.com/museumday/ticket/ Only good for September 24th, and it's only two tickets per family but still a great way to visit a museum for less than full price!!
I got lucky with mine. The museum we picked only charges for adults, so hubby and I get in on the free ticket and the kids are free entry anyway! I can't wait the boys are going to love it!