@Syst3matic did you get all rewards for it being completed? Close down the game and reopen it, these visual bugs happen a lot and it just takes closing it out and reopening
Hey there, as mentioned, you may want to restart your game and then check to see if the calendar updates properly. If issues persist, you could contact our Support Team and they could confirm what you received. You can reach them from the game's home screen by clicking the gear-shaped icon in the top-left corner of the screen and then scrolling down to the button labeled "Support".
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https://forums.playcontestofchampions.com/en/discussion/117884/calendar-reward-issues#latest