Hey, I have got a reply from Club Penguin on why some free users got to do the member stuff at the Medieval Party, here is the e-mail:
“Hello there penguin pal,
Thanks for taking the time to contact us. We always appreciate receiving feedback from our fellow penguins! We are always looking for ways to keep making improvements to Club Penguin. This is one of the many reasons your feedback is important to us. We’ve heard that free players would like to do more at parties on the island. This is why we’ve decided to do a test at this year’s Medieval Party to see if we can offer all players more during special events. A small group of free players has been randomly selected to participate in this test. They will be able to do Scorn’s Quest at the Medieval Party. Please know that this test is only happening during the Medieval Party for the time being. I understand that this may be frustrating for you, but I can assure you that there are lots of other fun things to do at the Medieval Party that don’t require a paid membership.
If you have any feedback about this test and what you’d like to do at future parties, please let us know. Although we can’t guarantee anything, we will definitely pass along your suggestions! Should you have any further questions or concerns, be sure to let us know. We’re always here to help!
Kristiane Club Penguin Support”
Club Penguin do care about non members and listens to our feedback :)