you have individually attacked people

I have not.

Two different organisers from venues where I have never been and could therefore comment neither one way not the other (Lymm and Market Rasen) chose quite wrongly to take my comments personally. The only venue I alluded to (and which Kevin Sheils quite correctly identified) was Walthamstow of which I do have personal experience and no criticism.

SOME organisers (as Kevin corrected me, not MANY) are incompetent/intransigent and the result of their ineptitude/greed/bungling have had the effect you describe on performers. I have not named them, not even obliquely, in the manner that one organiser attempted to malign a certain performer who may have behaved not entirely ethically. But the fact remains that MANY organisers are living in the past (circa 1979) and muddle along in premises and with practices which are entirely outdated and inappropriate.