Well sort of. When I going to conventions they really were. They were all fans and put on by fans not big greedy corporations like they are today. They were fun and we use to dress up in costumes we made ourselves. The first one I ever went to was in San Francisco and it was a Star Trek convention.
It was 1971 and I loved the "Planet of the Apes". I met a friend in college named Doug Jones. Not the same Doug but a different Doug. We were both in art class and I saw him doing a painting of the Metaluna Mutant standing on the Moon next to Jim Morrison. I went over and talked to him and later he invited me to his home where he had been sculpting and making masks.
I learned a lot from Doug which set me on a path to learn foam rubber prosthetics and of course my first was "Planet of the Apes". I went to Ape Con in La and actually flew down in full makeup on the plane. This all started my career.
Here's a few pictures of my early apes costumes and makeup.

About 73 I had just moved to LA. The hair pieces were actual screen used I got from Ricky Schwartz. I'm making up another ape off camera. We were going to a local Con.

Another Con about the same time. The costume was made by Paula Crist.

Left to right Ricky Schwartz, Ve Neill in the middle and myself all where screen used costumes I owned at the time. All the prosthetics are originals except mine that I sculpted. I always made my own.

My very first Gorilla suit at the apt that Ve and I lived at in Toluca Lake. Dave Ayres and Paul Gentry two life long friends there the day we tested the suit. Rick Baker came over to take a look that day he only live a few blocks away.

Me at a Star Trek Con at LAX about 76. Foam rubber prosthetic Sixth Finger. Lots more stories to tell to come.