What to do if you're not invited to party - awkward situation?

[Desdemona]

Act civil with them and act normal, as usual.
Theu clearly aren't the sort of girls you should be hanging around with, they certainly do not feel the same way about you. Hold your head up high and move on. They aren't worth it. Why would you want to attend a party where the hosts don't like you?
Do something else you find fun on that night to take your mind off things.