the back of the laser accepts 3 pin, but the output from the DMX box is DMX standard 5 pin, so they sell a converter that goes 5-3 pin. don't worry if you didn't order it though, it's just a matter of wiring it up, no circuitry needed, you can use alligator clips if you like, but it will be kinda messy, but who cares ;D just wire them up like this.
the 5 pin output on the DMX box:
pin 1= pin 1 input on laser
pin 2=pin 2 input on laser
pin 3= pin 3 input on laser
pins 4 & 5 aren't used
i'm not quite sure how big the place is, but he says its pretty jam packed when they are all in there, so it's about the size of a small theatre. i could be wrong though, but i'll have to check. yes i was thinking of turning the scanning size down and just moving it over the crowd, but there is one pattern that i think will look pretty cool in the room. in auto mode, have you seen the pattern where it shoots little beams everywhere randomly? if you slow that down, it shoots big bright laser beams everywhere, which i think will go far in the big room?