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How to remove unusable items from inventory

How can I get rid of unusable items in my inventory like the Valentines Chocolates and Christmas Map Fragments?

Unfortunately there is no way at the moment. Not sure why the game makers don't just build in some default to exchange unusable items for some 1k food and wood items (they did something similar once, but that turned out to be only one time). As it stands you just have to accept it stays there and who knows, maybe the events will be back after a year and you are still playing and you can use them again.