Hey. I lived in cairns for my beloved adolensce before moving to brissy for uni. The psy-trance scene in cairns is far more active then in brisbane in my own opion. Everyweek end there is at lease a bush down being held by many of the psy-trance crews that rock out. The websites listed above is good...
Try a record shop in town... Its inbetween where jono's use to be and the esplinarde (if you dont know were jonos was, ask any local you see in town.. its near the night markets and tasteys record store). I think its called Psk Sounds or something, its an aborigonal/psytrance store... They always have posters up in there, and the shop owner knows were most of the secret locations for the raves/events are...
Goodluck meeting new people and getting into the 'in' crowd in cairns cause IMO the club scence is shitty up there.