Dub step concert

So my boyfriend and I and our two friends who are a couple as well are all going to our first dub step concert on Friday. I'm pretty nervous about it tho. None of us do drugs but my boyfriend is considering taking some ecstasy. He's done it before years ago. But hasn't since. I have no idea what kind of affect it has on people. But here's why I'm nervous, and I know it has a lot to do with being insecure. But I'm Afriad he's goin to get all Highed up and end up trying to get with another girl or flirting with another girl. Which he never does cause he's a socially awkward person but I know that that drug makes you more of an open person. Like what if some girl is eyeing up my boyfriend and I go to the bathroom and come back out and they're making out. Or if some fucked up girl just comes straight up to is and does that or tried something. Like I'll lose my mind. The whole thing about a dub step concert scares me a bit. I'm probably over reacting but still. Maybe I need reassurance. But idk. How do people even dress there? I mean do people walk around like naked or half naked. I don't particularly want him staring or checking out some girl who's half naked with their tits out. I don't even know what to wear there or what to even expect.