By searching at GWWiki I found that these are the holiday events that are occur every year: Halloween, Wintersday and Dragon Festival. Then there are a few other events that only occur once and due to a special happening such as the Day of the Tengu.
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By searching at GWWiki I found that these are the holiday events that are occur every year: Halloween, Wintersday and Dragon Festival. Then there are a few other events that only occur once and due to a special happening such as the Day of the Tengu.
Don't forget about the weekend events that occur every weekend, where a special bonus is applied to a certain aspect of the game.