There’s going to be an official calendar added to the forum at some point, but in the meantime these cover everything:
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Upcoming Challenge Events (monthly, second Thursday): 🌟 Memento Challenge Events
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Seasonal Events: 🌿 Memento seasonal event
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Upcoming Class Trials (weekly, Wed/Sun): 🦸 Memento Heroes Classes and Class Trial Quests
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Upcoming Rare Quests (every 6-10 days, at random, but in order): 💫 Memento Rare Quests or RARE Quests - Reference Thread - Check spreadsheet for more details
And Atlantis returns each month, next up February 28.