metadata
That is strange. I'm assuming you've refreshed at least once so the other possibility is you have an extension of some kind blocking the web request that gets the event information. Since that request must be failing it is just leaving the Summer event up with the assumption it is still running.
Let me know if this doesn't help and I'll see if I can find the issue :)
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 "goku90504"){kind=small}
 "NinjaSailus"){kind=small}
 "LollygagGames"){kind=small}