There are many conventions held around technologies no longer in common use, but which still have an avid following of those that still find usefulness or enjoyment from them.

For example, conferences around the Amiga and the Commodore 64 are still going on in 2018. I would honestly not be surprised if there was truly a conference dedicated to the Gopher protocol out there.

If there was, I would totally want to read about it here. :)