Gen Con was this past weekend, its 50th anniversary. It was the largest ever, with 207,979 “turnstile” attendance (about 60,000 people, most of whom went for multiple days). It overflowed into the football stadium next door, and it still completely sold out before the convention started. Those are impressive numbers for a bunch of gamers getting together.
I skipped this year, and Gen Con may be too big for me at this point. That is a lot of people to have crowding into even a large space. Extroverted nerds are exceedingly excited, and cosplayers will have an ever-growing audience.