usually the DJ's tell you to give a word to Gridbot (once). And then the results are random once the DJ closes things up, and s/he declares it at some point afterwards.

Then YOU have to make your way to the DJ. Which means being on the same dimention, and getting directions to their location, or actually being AT the locale.
/tell gridbot contest-word-here
That one will enter you into the contest.
/tell gridbot say conversation-here
That one will enable you to talk to the people currently viewing gridbot chat, and usually the DJ on air is.

Usually.
/tell gridbot playing
This tells you alot of information.

What song is currently playing, who's DJing, and usually where they're DJing from and what dimention.
Just some handy commands.

Good luck out there!