How to hide the disturbing "Challenges" counter or leave the event until hopefully possible?
Every day it shows this counter (i.e. (1)) unless I visit the challenges to mark it "read".
There's literally no time available to participate in such events, and a reminder of lack of time due to work, personal issues, or incomplete desires/wishes is not why I visit the forum.
I am sorry, but all such forced counters and notifications for events or "experiments" that suddenly appear here and there you MUST reset manually regularly just to keep focusing on your business mostly disturb, distract, and desaturate the overall presentation of the service.
Again, some developers MUST have their mind in control to keep it organized, yet these forced notifications that you MUST focus on just to keep being focused become not a positive experience enough to appreciate the existence of such events in the first place, I believe, where some may develop a "reflex" against anything similar possibly skipping important or interesting but now accidentally missed notifications.
More to that, it may eventually cause negative attitude for such and future even, when you expect the "forced" behavior.
I do get that these events should also allow for more monetization and advertising that supports the platform, and lack of attention means less income, but I would pay for absolutely no destruction on the platform instead, yet there's no such option even.
Have you considered a single descriptive notification with choices for optional reminders, similar to how Google approached the account privacy reminder?:
