[quote name='kusee pee' timestamp='1472400374' post='3120831']
In my experience, it's worth being as accommodating as possible unless there's a real cost to you or a risk to your equipment. It's a shame you weren't asked before but if you show willing to do everything to make the event special then the chances are that the reputational benefits will come back to you. Particularly if you are trying to get a foot in the functions door. There have been many times where we've got bookings from guests, friends, relatives of the original client and it's as often from how we are to deal with as how we perform. Of course you don't want to be taken for a ride but you should be able to get a win from this I would think.
[/quote]
+1
They should have asked first, but it's really not a big issue in the grand scheme of things. Being accommodating and helpful will lead to more bookings. It wouldn't be untoward for the singist to buy you a pint for your trouble (but unlikely ime! )