Update by Community Manager QueenB:
NEW Sept 16th: Good news, the issue has now been fixed and the missing events/features should be back in the game.
Thanks so much to everyone who reported this and helped us confirm what was happening.
If anything still looks missing or not back to normal on your side, please let me know here and include a screenshot if possible so we can take another look.
Old update: We’re aware that some players are reporting that events and features have suddenly disappeared from their game, including cases where there was still time or progress remaining.
We’ve flagged this with the team and it’s currently being looked into. We’re waiting for more information, and I’ll share an update here as soon as we know more.
Thanks for your patience in the meantime.