If you've been alarmed by the groups of people shouting at each other in Volunteer Park recently, it's for a good cause: those are actors rehearsing and, believe us, it's better if they rehearse. The free-to-the-public Seattle Outdoor Theatre Festival, presented by Greenstage, unites a number of companies (Theater Schmeater, SSC/Wooden O, Open Circle, and more) willing to brave the elements and the flight path to SeaTac. (Greenstage is not just in Volunteer Park, by......