K/DA event question

Since I've found a lot of conflicting answers I though it would be best to ask her, up until when can we trade the tokens in for K/DA event related items. I can't seem to find answers anywhere and was wondering if it will just be randomly changed, since I had no clue when worlds or Halloween loot was being removed.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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