How do you get the Yuumi Space Day Icon?
It was a mission or event reward. Riot's description in the client reads: “Earned by participating in the 2020 Cosmonautics Day event (region exclusive) or purchased in other regions.”
Is the Yuumi Space Day Icon still available?
No. Riot tied the Yuumi Space Day Icon to 2020 (mission reward), and it does not normally bring back past event rewards or bundles.
