Boston's longest-running Octoberfest at Harpoon Seaport—Friday Octoberfest After Dark (black lights, DJs, stein hoist) plus Saturday's traditional oompah, competitions, and Festbier under the tents. 21+ rain-or-shine. Daily schedule / notes: Fri Oct 2 6–11p (last pour 10:30p); Sat Oct 3 noon–7p (last pour 6:30p). Listing = Fri–Sat opening block.