Idea:
Collect 12 Christmas ornaments around the main hub, but each ornament can only be obtained by completing a special challenge such as parkour, a maze, or other mini-trials. After collecting all ornaments, players can place them on the big Christmas tree and receive a cosmetic reward — Christmas tree branch wings.
More information:
Each ornament could be hidden in different themed areas of the hub, and every challenge should have increasing difficulty to make the hunt more engaging. The final reward — the “Christmas Tree Branch Wings” — would be a back cosmetic that fits the holiday theme and gives players motivation to complete the whole event. This idea could work as a limited-time Christmas event and bring more activity to the hub.