Celebrate the day with the most sunlight by pulling an all-nighter outside. I accidentally did this a few years ago as I locked myself out of my apartment at 11pm. I didn’t want to wake up the building engineer to let me in, so I just walked around a bunch. And then went to the Golden Nugget restaurant down the street until about 7:30am, when it was a more reasonable time for the engineer to let me back in.
I tell ya, there’s lots of people that stay up late on the summer solstice night.