*doinmummy^ - sounds like you have plenty of contingency plans in place.
i just wouldnt rest, but i think in part that is down to my job. each to their own. my issue was more around a regular problem i was having with the shifts i was working and DH changing his shifts without telling me.
it would have been a regular thing, and i refused.
i am a worrier. i admit it, and i know, if i left mine, id just worry and witter all night, so no point.
if your DD is mature, is happy to be left, has someone nearby for help if needed, then its probably fine.
its just me. i cant do it. i cant leave DS and he is 20 but he has SN and has set fire to his bedroom before now, left the front door wide open, and left the iron on......it would be a liability to leave him.
it sounded like the op in this is thinking more about the concert than the welfare of her kids - she asked for a sitter initially - either your kids are mature enough to leave or they arent.
i dont think mine are, so i wouldnt risk it.