Alot of girls usually go out to clubs in groups of 3-4, sometimes even bigger (as you guys already know)
I'm a pretty funny guy, so maybe this won't work for everyone but I've had amazing success with this.
I'll spot a group of girls, then approach them.
I'll say something along the lines of
"Look, you guys are all gorgeous, but I'm here to warn you guys about something.."
Like anyone, they ask "What's that?!" (Usually really intrigued to find out)
I'll tell them...
"Look, I know you guys are drinking right now, but I'm warning you there are lots of un-attractive guys here. Don't let them fool you with their terrible pick-up lines etc etc"
They always laugh and the rest plays it self out.
You guys can feel free to try this in your own variations
For the past 3 weeks of doing this for fun, I've counted 30+ numbers closes and 5 f closes out of this.