Confusion About Midnight Party Participation and Prizes

I’m feeling a bit puzzled about the Midnight Party events. I participated once and noticed that the notes mention you can join up to three times a week. However, I’m having trouble figuring out how to participate a second time.

Additionally, I seem to be unable to claim the prizes I unlocked from my first participation.

Lastly, when I log out, the Unclaimed Awards section indicates that I can still join the Midnight Party. Can anyone clarify what’s going on with this