That was 50 years ago, and an apparently dead series by season 2, made it to half a century, spawning movies, novels, other TV series, other movies, fanzines, fanfiction, and historically the birth of slash.
I was an 80's baby, so my Trek was The Next Generation where I worshipped Picard and Data, but it wasn't until the 2009 reboot movie that I delved into everything Star Trek, including the TOS, all the movies, books and cosplay and I lay all the blame on ONTD_startrek and all it's GQMF's.
To celebrate this historical day (even if in a sad year for the Trek family), please feel free to comment on this post, share memories, meetups, encounters, anedoctes, and post a hell of a lot. A lot of websites will be celebrating this phenomenal birthday, so please share anything you might see. I'll be at hand to aprove posts. (please remember to build up a post, don't just sent in a link).
In Portugal, every first theatrical session of Star Trek Beyond will be free tomorrow, as a way to celebrate. I'll try to catch one if I can. Is your country/city/state doing something?
Live long and prosper, fellow Trekkies.