Calendar events are windows of opportunity during which you either gain discounts or bonuses when completing specific tasks or gain access to a mission or mission chain (also called "gated content").
This page will introduce you to the event categories and provide you with brief information on each event as well as link you to more detailed information on each event.
Most calendar events are listed in the Mission Journal (opened by pressing J or by clicking on the 'Hail' button, which is located in the bottom left corner of the Mini Map) allowing players to access more detailed information on any event by clicking on the event image.
Certain events are not listed, these are either random events only accessible during random times of the day or are special events announced by Cryptic Studios only accessible during specific times and dates.
 Journal events
|Time to Craft!||Enjoy a 20% reduction in the amount of non-replicatable materials needed for Crafting items at Memory Alpha or Qo'noS while this event is active.||60|
|Mirror Universe Incursion||While this event is active, Starfleet and KDF officers level 10-50 and 20-50, respectively, may join the fight against the Mirror Universe and earn bonus XP for every starship you defeat as well as 480 Dilithium Ore per round.||60|
|The Path to 2409||Complete your daily Lore missions while this event is active and you'll earn an extra data chip.||60|
|Multiphasic Event||Search for Anomalies while this event is active and you will earn bonus Data samples and Particle traces for use at Memory Alpha or Qo'noS.||60|
|Tour the Universe||Test your ship and crew with a race across Sector Space for Energy Credits. To pick up the mission; Starfleet officers talk to Jay Yim in Club 47 and KDF officers talk to Targak in the First City bar.||60|
|Academy Event||Help cadets at Starfleet Academy and the Klingon Academy while this event is active for a chance to earn Dilithium Ore Containers.||60|
|Officer Reports||Play missions that other players have created using the Foundry during this event and earn bonus rewards!||60|
|Dilithium Mining||Earn extra dilithium ore while this event is active. Head to the asteroid field near Bajor, in the Beta Ursae Sector Block, and don an EV Suit to engage in dilithium mining||60|
|Vault Shuttle Event||Earn extra Romulan Marks by completing the “Vault Shuttle Event” while this event is active.||60|
|Fleet Marks Event||During this time, specific queued events and content will reward bonus Fleet Marks.||120|
|Reputation Bonus Event||During this time, specific queued events and content will reward bonus Romulan and Omega Marks.||60|
 Special events
|Anniversary Event|| Celebrate the continuing growth of Star Trek Online. Event starts on February the second of each year.
One year (February 2-9, 2011): “It's Q's Party”, “Benevolent BeQuest (Daily)”
Two years (February 2-6, 2012): “The Odyssey Class”/“The Bortas Class”, “Party Crashers”
|"Q" XP Weekend||Get double XP to help you earn rewards.||Varies|
|C-Store Sale||Take 20% off all C-Store Purchases.||Varies by Holiday|
|Featured Episodes Special Rewards Rerun||Special rewards temporarily available for completion.||Varies|
|Q's Winter Wonderland||Q grants access to a Winter Wonderland of snow and ice, with a game to play every day and with such wonderful packages… So put on your party shoes and get ready to celebrate! The festivities started Thursday, Dec. 8th 2011 and lasted through to Jan. 2nd 2012!||25 days|
|Dilithium Bonus||Get a Free EV Suit for “Asteroid Mining”. As a bonus incentive, pick up a free recolored EV suit at the dilithium mining outpost in Beta Ursae sector block. This event ran from March 23, 2012 starting at 1pm and ended on March 26, 2012 at 1pm||4 Days|
|“Hearts and Minds”||Every Friday the thirteen get a free duty officer by completing this short horror-style mission.||2 Days|
|“First Contact Day”||From April 5th 2012 to April 9th 2012 Federation players could celebrate the First Contact between Vulcans and Humans at the Utopia Planitia Fleet Yards.||4 Days|
|“The Next Generation: 25th Anniversary”||To celebrate the 25th Anniversary of Star Trek: The Next Generation a mini-mission was offered that will ask you to go to speak with Worf in the Holodeck of either Starfleet or Klingon Academy.||July 19-24, 2012|
 Removed journal events
|Ground Invasion of Defera||During this event Defera Prime comes under attack by the Borg and player have a chance to participate in easy, medium and hard missions on to earn Energy Credits, special loot unique to this event and more.|| 180|
(This content is now always available)
|Crystalline Catastrophe||While this event is active, Starfleet and KDF Officers may join the fight against the Crystalline Entity and earn Bonus XP or a trophy for their starship interior.|| 60|
(This content has been temporarily removed)