Hello Penguins! My friend Slidoo showed me this AWESOME Glitch! You can actually go to the Nightclub Rooftop after the Puffle Party is over! Here are the Steps-
1- Log in to this link, and you will automatically be in the Wilderness- http://play.clubpenguin.com/?rm=854#login/
2- Now walk south, and you will be on the Night Club Rooftop!
Isn't this is cool Glitch? THANKS again Slidoo!