Well, gee, you've given us ALL sorts of wonderful information to help us out.
(please note the sarcasm)
How big? Dimensions? Type of crows? Atmosphere? What is your budget? Why type of SPL do you want/need? What is your coverage area expected to be? Spin discs only or expect bands and/or national touring acts/performers?
What sort of light show do you want/need?
Power distros? How much power you have?
I can give you a budget of around $100K right now for sound, won't include a single light fixture. Of course, no DJ stuff in there either, and that's just a PORTION of what I carry to an event.
Turst me, outside of maybe a couple or few CD decks, and maybe a DJ mixer, you will want a better mixer(minimum) for that to go into, an RTA, perhaps a speaker management system, proper ratio in amps and power distribution to your tops, mids, lows and subs. You don't want your sound system to be "DJ" stuff, trust me, it won't hold up and won't be a great idea. Are you flying or planning to fly speakers? You've got to think hanging points, possibly motors, chains, safety, fail-safe and the like. Don't let your "spinner-du-jour" have access to your house EQ, they'll just dink it up, so keep your RTA locked up tight. Someone figured out how to make a ********* digital ERQ knock OUT low frequencies when pushed too hard, in order to wake up DJ's who don't understand concepts such as balance and clarity, or overdriving and distortion.
Lights is a WHOLE OTHER story. Intels, cans, wash, movers, haze, bubbles, snow, fog, changers, effects, lazers. You can go nuts there as well.