|CN||June 1, 2021 ~ June 8, 2021|
|Global/EN||December 9, 2021 ~ December 19, 2021|
Clear 1-10 to access PL operations.
During the event, all operations except Challenge Mode, Annihilation, and Inferno Mode operations will award Clearance Permit equal to the amount of Sanity spent, which can be exchanged for various items at the Trading Station.
The Revolution Symphony headhunting banner is featured.
All of the above outfits are part of a crossover between Arknights and I.T., with Thorns' Cómodo outfit also able to be obtained via a code redemption (only in the CN server; if the player already bought the outfit from the Outfit Store, the code is obsolete).
The "Collect All" function for missions is added, in which the player can collect all the mission rewards at once, eliminating the need to click on each mission individually to do so.