[quote name='stingrayPete1977' timestamp='1482162112' post='3198128']
If I come into your place of work to carry out a job I'll be required to be insured against my actions, that goes for Tesco or a pub if you are going in as a worker not a customer.
If the venue employed you directly it would indeed be their responsibility to ensure their insurance covered having a band with a stage and loose cables etc. Coming in at the request of the bride or the venue as a sub contractor you will need your own insurance, same will go for the disco, caterers if they are bringing equipment in, bouncy castle whatever, it's all standard stuff.
We had three PAT test venues and one public liability request last year but probably more like a dozen gigs that should have asked us if they were doing their job properly.
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^This. As a band you are self-employed, you haven't gone on the venue's payroll for the night.