The schedule of events and quests in Empires & Puzzles is quite complex. There are daily, weekly, montly, and yearly cooldowns, quests, and events that each rotate regularly.

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2020 Events & Summons Calendar

All dates posited are to be considered tentative and are the author's best informed guesstimate according to when events were held in 2019 and established patterns.

Rare quest dates are not included as they occur anywhere between 6 and 12 days apart, approximately once every ten days, making them both common and a little unpredictable date-wise.

2020 Tentative Calendar of Events

These dates are tentative, but based upon when they occurred last year, along with well established norms and official announcements. Actual dates in-game are subject to change (esp. in December).

Since June 2020 (Version 30) all recurring Events start on Monday or Thursday, and they are scheduled to start and end at 07:00 AM UTC.[1]

Common Cooldowns:

Energy Replenishment

World Energy: 10 minutes

Raid Energy: 1 hour

Titan/Alliance Energy: 4 hours

Daily

Wanted Missions (12 hours between chests)

Mystic Vision Cooldown (8 hours)

New Titan appears (23 hours)

Two new regular quests

Weekly

Two Class Quests

Two Alliance Wars

Weekly Raid Tournament

Monthly+ Cooldowns

Weekly

A new Rare Quest

Monthly

Atlantis Summon (from 1st Thursday of every month to next Saturday (60 hours))

Challenge Event (from 2nd Thursday to next Monday (96 hours))

Costume Event (from 3rd Monday to next Wednesday (48 hours))

Tavern of Legends (from 3rd Thursday to next Monday (96 hours))

Valhalla Summon (from 4th Thursday to next Monday (96 hours))

Path of Valor (from 1st Monday of every other month for 50 days)