So what’s a Pendarvis, and what sort of pattern does it contain? Behind Dean Gray’s somewhat cryptic title is a sweet, sincere, but very small exploration of Midwestern mid-20th century life, and how varying small-town factions got along together, or didn’t. Its source material, Will Fellows’ 2004 book A Passion to Preserve: Gay Men as Keepers of Culture, probably tells us more. What’s onstage at HERE, a production of the New Dog Theatre Company, amounts to a snapshot—an intriguing snapshot, but one with a frustratingly blurry focus. Dean Gray’s three-character drama of gay life in homophobic 20th century Wisconsin is sweet