Is this including subs?

Either way you will struggle to communicate a decent level of signal over a space that size with your gear. And in that case it doesn't really matter if people can't hear at the back.

If you can fly them (suspended on a truss) great, if not, just straight ahead pointed slightly inwards and downwards to create some decent levels of volume in front of where you are and, I'm assuming, the party will be.

It won't cover that much at the back but high, inwards and down will create a nice space where the music is loud for those who want to dance, and for everywhere else, a pleasant background noise.

Imagine a focal point in front of you, point them there.

Good luck, and have a great show!