When does the Frosty Fest Rocket League Credits 2021 Rocket League Christmas event surrender?
It appears likely that the Frosty Fest 2021 Rocket League Christmas event will surrender on 0.33 January 2022.

That is even as the event's second and final Limited Time Mode (LTM) will conclude, so it makes experience that the overarching Rocket League Items Shop event would possibly surrender at that factor as well.