Things They Should Invent: public birthday parties

Sometimes people can't celebrate their birthday on their actual birthday, because the people they most want to celebrate with aren't available on that day.

Solution: public, meet-up style birthday parties for anyone who has a birthday that day.  I'm picturing the parties being held by a group of bars or pubs - the kind of place where any random person can walk in and have a good time - that would rotate among themselves so each one has to throw a birthday party only every couple of weeks or so.

You go in, show ID showing that it's your birthday, and you're entitled to one free drink and a piece of cake and maybe all the nachos you can eat over the course of the evening (or whatever else they can give away without wrecking their margins).  The employees (and, hopefully, other customers and birthday people) congratulate you and wish you happy birthday and generally make a fuss over you.  Maybe there could also be bonus freebies for people celebrating a milestone birthday. There would also be a general discount for people whose birthday it isn't on birthday party days, so there will be other people around to wish happy birthday to the birthday people.

The bars get attention, publicity, drink sales (because few people are going to limit themselves to the one free drink on their birthday), and maybe some new regulars who remember how this bar made them feel happy and welcome and celebrated on that birthday when they were all alone.

The bar's regulars get a discount and a bit of a party atmosphere on that particular day, and the possibility of attracting new and interesting regulars to the bar (if the birthday people are made to feel happy and welcome and celebrated.)

The birthday people get something fun to do on their birthday that makes them feel happy and welcome and celebrated, plus they get to meet other people who have the same birthday and thereby make friends who will totally be into celebrating their birthday on their birthday next year!

And, because the birthday people will meet birthday buddies, they might be able to make it just a one-year project. This would eliminate any "Meh, I'll go next year" sentiment among the birthday people, and thereby increase attendance and popularity.