I booked tickets for me and DH to go to see comedy in a city two hour from home. The plan was for my 2DC to stay at my MILs, however my DCs don't want to stay and have asked to be left at home overnight, tickets and hotel non refundable. Our eldest will be 15 and 11months and the younger 14. They get on really well and are both sensible.
The neighbours will be there if the DCs need them, we act as back up if either couple has an evening out.
My DH feels leaving them would be fine, but I'm a bit anxious about it.
YANBU - just go, the DC could leave home in a month.
YABU - cancel and stay at home you'll have to wait for the next opportunity once DC is 16.