First Doctor episode: vaguest memories of Fenric. Which had to be turned off as it was "upsetting the wean". Many years later, I had to do the same for World Enough and Time. Life, it's cyclical, you know!
First film - at the cinema? I think this was also The Aristocats, on one of its many Muirend Cinema (much missed) repeats. Wasn't there a Honey I Shrunk the Kids film around the late 80s? That's another contender.
First gig: Some no name Glasgow band in that place down Renfield Lane. I don't do gigs, being antisocial. I did once have tickets for Nerina Pallot but wound up in hospital instead, a life lesson learned there.