CHRISTOPHER HOUSE A new work by Peggy Baker or Julia Sasso is a reason to get up and dance, and Sasha Ivanochko and the muchin-demand Matjash Mrozewski are big draws. Maybe now that James Kudelka has let go of the administrative reins over at the National he can focus on what he does best: create good nonnarrative dance works. But the king of contemporary has to be Christopher House, who keeps pushing the envelope in terms of what works dramatically onstage. His new piece next month is a collaboration with hot local troupe the Hidden Cameras. It won’t be hidden for very long.