The Japanese version of Fate/Grand Order is running the Csejte Halloween Trilogy Ultra Deluxe Compilation event, which will allow players the chance to obtain three free Servants.
The Csejte Halloween Trilogy Ultra Deluxe Compilation event will run from October 6 to October 31, 2021 on the Japanese Fate/Grand Order server.
This is a combination of three past Halloween events — Halloween 2015, Halloween 2016, and Halloween 2017.
Currently, the Halloween banner for Fate/Grand Order features Servants who played an important part in the Halloween stories.