I have no idea where Mr. Shatner was on Friday, September 17, 1976, when the orbiter Enterprise was rolled out in Palmdale. But for what it's worth, Shatner wasn't really shying away from Captain Kirk and Star Trek. Back then, Shatner did a stint on The Storybook Squares (a kid version of The Hollywood Squares with fictional kid-friendly characters instead of actual stars) as Captain Kirk.
Thanks for the pics. I had never seen that show as I can't stand game shows in general.
As for the clothes I well remember wearing clothes like that in the '70s.