Season 3, Episode 36 - Season 3: Episode 36 (Do-Si-Do and Do-Si-Don't) Original air date: 9/3/13. It's Regionals and the pressure is on for Abby's dancers to prove they are worthy of attending Nationals. Abby assigns what appears to be a simple country-style group number, but the hoedown proves so physically demanding the girls aren't sure they can pull it off. Meanwhile, with Nationals just around the corner, Abby comes up with some interesting pairings for duets that put the dancers and their moms to the test. Check out "Dance Moms" photos and extras!