I always go by the rule that you go to the party/event that you got invited to first and not cancel for 'something better'! because it has annoyed me when people have done it to me!
That's it really.
DH's friend sent us an invitation to his and GF's party a while ago and we accepted. Friend has just arranged a night out for her birthday on the same night.
I've been excited about DH's friends party but now feel dreadful telling my friend I can't go on her night out.
AIBU to tell her I've already got plans?