I suspect that that this may have been done before, so I will try and be specific:
a) The first band/artist you paid to see (not including festivals)
b) Who did you go with
c) Was were your impressions of it?
d) Did you end up a long term fan?
a) Mine was The Monochrome Set at North London Poly sometime in the second half of 1983.
b) Went with my first proper girlfriend who was quite a fan. Quite a long way from South West London, most of the way up the Piccadilly line.
c) Had no idea what to expect being a tad naive but I really enjoyed it. Possibly not the era or line up most beloved of The Set connoisseurs but it was the one I knew, plus we had listened to all the albums quite a lot, so knew most of the songs. Stood right near the front. Like many others who speak about their first gig, I loved the way the sound of the bass and drums hit you right in the chest. And it was pretty loud!
d) Ended up seeing them about three times more in the next couple of years before they split for the first time, although they’ve since reformed a couple of times. Saw them again in 2012 at Dingwalls as a result. It was OK, but good luck to them. I don’t really listen to them now, although when a song pops up on a playlist it makes me smile and think of the first girlfriend.