You spend about a third of your life asleep. You'll work for around 90,000 hours in your lifetime. You'll spend at least 3 times that queuing for the bar in nightclubs. The cooler the venue, the longer the queue/more inefficient the pretentious bar staff.
Introducing Nightclub Vending Machines. One wall of the dancefloor is a row of vending machines selling canned craft beer, cocktails that are mixed by a coffee machine-like robot, and self-serve draught beer.
Payment is by contactless card or possibly facial recognition. Tabs can be split automatically between friends. Browse on a touch screen, see nutritional info about the drinks, even start a video call with the bearded hipster that brewed your favourite beer to get his recommendation. The clubs sell 10x as much, no one ever queues again. The DJ could even control a light show inside each machine.
Next up: "Bouncer Machines" that perform a kind of on-the-spot credit score to determine your riskiness as a patron.