As far as small-town opera houses go, this one has enjoyed a pretty illustrious career. The Woodstock Opera House has appeared much more in national culture and history than its charming setting might suggest. It was the backdrop to the 1890s prison release of a famous labor leader and would-be presidential candidate, several notable actors began their showbiz careers on its stage, and in the 1990s, moviegoers watched as a curmudgeonly protagonist played by Bill Murray jumped from its bell tower. After the Civil War, opera houses began to spring…