In massive multiplayer online games, which is played by thousands of players at a single instance of time and is ran by the revenue generated by its player base, it is always a good idea to keep adding new content into the game to keep the player base interested. In such a scenario, it s always good to make use of traditional and cultural festival which are common across the globe and re-skin the game or add promotional or seasonal events for the same.
Examples[]
Guild Wars 2[]
Guild Wars launched in 2012 by ArenaNet, is one of the most popular mmorpgs which is famous for its seasonal and festival related themes and events, which would only be accessible to the players during that particular season or festival. e.g. Halloween Events.