Magic, You and only you need to make a decision about attending the cocktail function. It's either a go or no go. Comments/thoughts from others shouldn't be the determining factor in what you do. If you want to go...then go. If you want to sit home and watch TV, then by all means do so.
Decision making appears to be a weak link for you. It's time to practice being more independent and making your own decisions w/o seeking our advice each and every time something comes up.
Deciding what to do this evening is an easy one and doesn't require analyzing and dissecting it to bits. Sounds to me like you don't want to go...is that correct?