Conversation so far:
Who were the judges?
Beginning with the seventh season, Michelle Visage, Ross Mathews and Carson Kressley are the staple judges alongside RuPaul.
Who judged after these judges?
Guest judges have included Paula Abdul, Pamela Anderson, Eve, Ariana Grande, Neil Patrick Harris, Kathy Griffin, Debbie Harry, Khloe Kardashian.
What do the judges judge?
The judges each provide their opinion on the contestants' performances in the main challenge.
What else do the judges do?
CANNOTANSWER.
What else is there to know about the judges?
The day before judging, the contestants are all provided with a song to which they must learn the lyrics.

Question: What do they do once they learn the lyrics?
Self-contained rewrite: What do the contestants on RuPaul's Drag Race do once they learn the lyrics?