EASTHAM — The Chapel in the Pines was a lively scene on the evening of Feb. 1 as seniors arrived from across Cape Cod bringing with them enough walnut and winter greens salad, scalloped potatoes, and spanakopita to feed a small village. A colorful pride flag waved from the porch of the Nauset Fellowship’s 19th-century Chapel in the Pines for the occasion: the Eastham Council on Aging’s inaugural Shake Off the Winter Blues Pride Potluck, a dinner party for LGBTQ seniors.