The Radahn Festival is an in-game event in Elden Ring that can be started after completing certain prerequisites. To start the Radahn Festival, players must first defeat Starscourge Radahn, a powerful boss located in Redmane Castle. Once Starscourge Radahn is defeated, players can then talk to the festival organizer, Jerren, who will provide them with more information about the event.
The Radahn Festival is a large-scale event that features a variety of activities, including a jousting tournament, a battle royale, and a fireworks show. Players can participate in these activities to earn rewards, such as unique weapons and armor.