[taylalatbh.]

The only thing you can do is speak to him about it. He probably won't not go unless there's a good reason for it. You should come clean about your boyfriend, too. I'm sure your dad will be very disappointed that you didn't tell him the truth. It sounds like you're probably under the age of 18, so in that case, dads rules are right. You need to follow his rules because you're still a child, and as much as they might suck, he's incharge. If you're honest and upfront about things with him, he may start treating you like an adult.

So all in all, talk to him about it. If you don't want him there, tell him. He needs to know that you're going to be safe, though, so maybe say that there are other adults/parents there instead (but don't lie about that).