Fasnacht Day takes place in Helvetia and begins at the top of the hour while the seasonal event is active. Players help the Master of Ceremonies prepare a parade, complete tasks for robot marchers around town, and protect the procession as it moves through Helvetia.
Five marchers are chosen each event, each assigned a different prep task. Once all five are ready, the parade begins. It stops several times for enemy waves before ending at a final area where a random boss spawns. At least one marcher must survive for the event to count as complete.