Downtown Arts will host a series of master classes celebrating, Dance Theatre of Wilkes-Barre’s 10th anniversary. The first one will be Sept. 3, with a morning, modern dance session taught by Catherine Schaeffer from 10 a.m. to noon and an afternoon, ballet and lyrical dance session taught by Lauren Timek and Raphael Cooper of the Dance Theatre of Wilkes-Barre faculty from 12:30 to 3 p.m. Schaeffer, who recently relocated to Northeastern Pennsylvania, has danced with a dozen professional modern dance companies, working with renowned choreographers in New York City, Baltimore, Washington, D.C., and Phoenix.