Hey folks,

Got a gig next week, going to comprise of me playing some crap on a laptop, to be very vague about it. Just wondering if my EMU 0404 USB will be okay to just go into the mixing desk right outta my laptop ?

You should be able to just take your 1/4" analog outs into your mixer, although you'll need adapters to go from your 1/4" female output on the Emu 0404 to whatever you plan on using for your input. Just start out with your laptop/Emu volume level turned way down, so you won't overdrive your mixer inputs.
Have fun playing some crap!