By Paolo Sandoval Memorial Day may mark the unofficial start of summer, but, if you’re anything like us, the warm-weather adventures have already begun. From beach trips to days on the trail, nothing beats a day out and about — if you have all the prerequisite equipment, of course. Lucky for you, REI) is throwing its booming Anniversary Sale), which means now is your best chance to grab discounted gear and garb for all your warm-weather escapades from your favorite brands and suppliers… until next year, at least. The annual sale has already begun, and runs now through May 30, with spiking savi…