Would you be ok with your bf going to a rave/music festival without you?

Sooo my bf invited me to go to a rave with a friend of his (I don’t really like this friend because he’s constantly talking about girls they see at the gym and flirting with them even though he has a gf) and a few other people that we don’t really know. I don’t really want to go and I work that weekend so I can’t anyway.

I don’t want to be an annoying gf but the idea of him being around tons of half naked girls who are overly friendly because their drunk or on ecstasy makes me uncomfortable.. I trust him I just don’t like the idea of this. How do I handle this?