As outlined in our August 22 launch blog, each of our annual expansions will be broken down into four major releases. In addition to the story, systems updates, and other content added in those four releases, each one will introduce a fresh set of Wizard’s Vault rewards and objectives. In the months between each update, we’ll release a profession balance update and a festival (or two, depending on the time of year) and run bonus events. We might also make updates to the core game (i.e., content not related to the latest expansion) in this period, but that may not always be the case.
We’ll share the dates for other bonus events as they draw near. The in-game Halloween festivities will run from October 17 to November 7. Sometime around then you can also expect to hear about the next major update for Guild Wars 2: Secrets of the Obscure.
https://www.guildwars2.com/en/news/studio-update-september-2023