This is the list of all the official events launched by the game staff.
On these occasions, qualified players gain access to special maps, which usually pertains to specific World War 2 battles. Exceptions include a tie-in to the anime Aoki Hagane no Arpeggio: Ars Nova. These maps are only available for the duration of the event (usually 2 weeks) and have better drop rates than normal sortie maps.
While sortieing in specific event maps, special Abyssal Fleet bosses may be encountered on predefined nodes. Although these event-limited enemies are strong, recurring bosses such as the Battleship Princess could also drain out an admiral's bucket reserves.
Starting Spring 2014 event, LoS 
-based checks were implemented. A fleet's total or equipment LoS affects movement through the map nodes and reaching the boss node. This mechanic has then been implemented onto extra operations maps.
Event List
Tips
- The standard requirements to participate in an Event are:
- At least a 75% sortie win-rate. This is shown in the Fleet HQ Stats page.
- At least 5 free ship slots for new kanmusu to join before sortie.
- At least 20 free equipment slots before sortie.
- A stockpile of
resources & 
buckets. Experienced admirals may have suggestions.
- Common knowledge says that resources' natural regeneration will allow the completion of all event maps in the usual two-weeks window. However, it depends on the mercy of RNG for the fleet's consumption, damage dealt & received, pathing, & the amount of retries to clear an event map.
- The natural regeneration tip is not applicable for buckets. It's recommended to stock-up before the event.
- Although it's also a game rule-of-thumb, it must be reiterated: always have at least two of each ship type ready & levelled as the event maps' fleet composition requirements will never be known beforehand.