Should i go out to this event even though the host hates me?

That's what he's expecting. He doesn't think you can bear to go. Show him up and go to that party with your boyfriend. If he says anything to you, stand up for yourself, tell that punk what's up. He sounds like a prick, so go see him off and just forget about the whole mess. If you ruin his party you ruin his party big freaking deal.. and if you're boyfriend has a problem with it then so be it. Stand up for what you are and who you are, don't ever let anyone talk down to you. Stand up for what is right. Anyways, go to the party, have a good time. Simple as that.