Special ascension

I read that at some point we will be able to perform an one time action to take a single servant up to max ascension (10lv below max) for free. Does anyone know what campaign that is attached to?

Next year Anniversary
https://fategrandorder.fandom.com/wiki/Fate/Grand_Order_Fes.2019%EF%BD%9E4th_Anniversary%EF%BD%9E#Special%20Ascension

Edit: I have no idea how to force forum to parse “.” in URL

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