Bakeoff basics (but check the DG board for things specific to this event):
During a submission period, people submit poems of a certain limited kind (sonnets, children's poems, light verse, whatever) to a person who is going to coordinate the proceedings (usually called the host, or the screener). Usually these can be either published or unpublished poems.
When submissions close, the screener records whose poems is whose and then takes identifying information off the poems. Then the poems go to the judge. Maybe all of them go, if there aren't tons of them, and maybe the host picks a subset.
The judge picks a favorite ten, or sometimes twelve, and posts them on the Distinguished Guest board, usually two per day. The judge says what he or she likes, or doesn't, about the poems, and then other people do that too.
At the end, we pick a popular top three, and the judge picks his or her top three.
Hope that helps!