Although I didn't attend them, reading about the early Trek conventions was exciting! Here was proof that others loved the show as much as I did, and that I wasn't the only one! (It's funny to think back on my earliest days as a kid when I first discovered the show, and thought I was the only fan.) Here is a first-hand account of the 1975 New York Star Trek convention, written by James Van Hise, who went on to publish and edit his own fanzine, "Enterprise Incidents." Many fans know him as the writer of a large number of unofficial Trek softcover books that had national distribution. The con report comes from issue #4 of "Trek: The Magazine For Star Trek Fans," printed in March of 1976. Incidentally, this was the first issue of the late, great fanzine that I ever saw or bought. Up til now, all the magazines and such I had bought only featured Trek now and then, but this was the first magazine of any kind, professional or fan-produced, that I had found that was devoted entirely to the show. For me, this was Nirvana. I have such good memories of the excitement and happiness that reading it brought to me at the tender age of 17. The fact that it had color covers and it was printed on card stock made it all the more special.
Now, I know that the Blish books are not rare, or hard to find images of the covers online; and that most fans are so familiar with them that there might not be much point in posting them here. But, these are my copies, and they meant so much to me at the time I bought them, and mean a lot to me now for the memories they hold; thus the reason for including them as bonus items. I enjoy sharing those memories and enjoy reading when commenters share their own.
Bonus: Below is one of several ad fliers Paramount distributed to sell the show abroad in the 70's. This is a from an article about foreign Trek material in the Trek Special #2 published in 1978.