As for me who had remission of H (mostly) and was used to mild T and now has a setback, it was social expectance who drove me to the small village carnival (I was being cautious, but not enough as I should have) and then the fun let me forget the risk of spontaneous excessive noise (I was only protecting against predictable noise, but didn't think of unpredictable noise).
This is actually pretty much the same thing as what gave me my initial T. I am a very social person who has always had difficulty to live out this aspect of myself - I used to be very shy. So when I was at the concert that gave me T I felt so much at home and finally being at a place I had always wanted to be that I didn't think about the risk of T (I was expecting a bit of hearing damage, but not T). Carnival was similar. So the only thing I can learn is that fun makes me forget risks, and I have to screen for situations in which I might forget risks and avoid them alltogether.