During the Event Period which is from September 21, 2022 (Wed) after maintenance to October 5, 2022 (Wed) before maintenance, visit Lara and ask her about the Heidel Ball.
Summon the Black Spirit (,) to get the [Event] Welcome to Heidel Ball! quest
then head to Lara and '' Chat '' with her
That's all about this guide
Enjoy your time !