Good thread - plenty of good advice.
Just a quickie here on Insurance.
No matter how much you are insured for, if you are proved negligent your Insurance Company may not pay out. (So never say "sorry").
That`s why it is imperative to have your gear PAT once a year (as has already been pointed out).
Depending on how far into the field of Entertainment you want to go, you could join Equity, as they include £2,000,000 of PLI as a standard benefit of membership. Also £150 "Back Stage Loss" - in case summat gets nicked!
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When you start playing venues look to your own safety as well a