“Forum Theatre, the little company in Silver Spring that on a modest scale championed some of the most advanced ideas in modern playgoing, announced Wednesday that it would be closing shop for good on July 31, after 14 years of putting on adventurous shows. … Factors includ[ed] the crowded theater landscape in the region and [artistic director Michael] Dove’s desire to explore more esoteric kinds of theater than could be sustained by the company.”