Easy solution used by the NYC startup I work at: Schedule a company standup meeting at 4:30 or so. Everyone cracks open a beer to enjoy while presenting what t

Easy solution used by the NYC startup I work at: Schedule a company standup meeting at 4:30 or so. Everyone cracks open a beer to enjoy while presenting what they have been working on for the past week. The standup lasts 30 mins or so, after which those who want to leave take off, and those that are going to continue working usually grab another beer and head back to the computer.