DANCE: George Balanchine's A Midsummer Night's Dream, in a Francia Russell staging, opens tonight at the Pacific Northwest Ballet. Scenery and costumes are by the irrepressible Martin Pakledinaz, evoking a primeval Pacific Northwest. With Shakespeare's play as the basis, Balanchine turned to Felix Mendelssohn's music to dream on the childhood relationship to nature, and the nature of relationships. Here's the video preview. (Photo: Carrie Imler and Timothy Lynch; © Angela Sterling) 8 p.m. //......