Friends sorta

I have to go to my friends birthday party tomorow and there are going to be people I hate at the party. My friend Izzy(she's the one having the party) is going away for 10 months to Germany for schooling and I wont see her the entire time. I know she invited 2 people I really hate, Melody and Ophelia. I've disliked both of them since last year for things they did that I likely can't say on here without it being flagged. But they are both annoying and bad people, but it's not like I can just avoid them, they still think (or act as if we are) friends even though I have made it VERY clear that I dislike them both and will not tolerate them. I am rethinking on going to this party due to the actions and things both Melody and Ophelia have done but it will also be the last time I see Izzy.

If anyone knows how I should handle this or how to avoid them, please I need the advice.