Events are large scale alerts that usually last longer than 24 hours. Participating in these events will reward the player with rare or brand new equipment, blueprints or Mods.

Fusion Moa Event
May 3 to May 6, 2013
The rewards for Tenno who participated in the event, by killing at least one Fusion MOA, were a Frost PrimeIcon272 Frost Prime blueprint and Credits64100,000.
Artifact Defense Event
June 21 to June 24, 2013
The possible rewards from this event's mission were Mod TT 20pxCorrosive Projection, Mod TT 20pxShield Disruption, and Mod TT 20pxInfested Impedance. The missions were defense missions, which could've been against any of the three factions and had a variable number of waves that needed to be survived in order to complete the mission.
Informant Event
July 5 to July 7, 2013
Very similar to the Fusion MOA Event in which a global operation is held requesting all Tenno to attack a brand new enemy. The event rewarded all participating players with the CorpusSniperRifle Snipetron Blueprint, a weapon which was removed in the past due to it not following Corpus lore, along with the DESnipertronVandal Snipetron Vandal so long as the player had at least 20 Informer kills.
Sling-Stone Event
July 26 to July 28, 2013
Required Tenno to attack the Infested to obtain Corruptors. These Corruptors were then used to taint the fuel cells of large Fomorian ships of the Grineer as a Mobile Defense type mission. Tenno had to attack and destroy one Fomorian ship for each planet and success rewarded them with new Ammo Mutation mods, 2-5 dependent on how many points were obtained by the player. alongside this all contributing Tenno also received a holographic badge.
Operation: Arid Fear
August 9 to August 15, 2013
The first event to last more than 72 hours. Tenno were to take part in special replayable alerts which rewarded them with Corpus Datamass and Corpus Cipher which were used as components to create Corpus Void Key. These void keys would take players to a special Corpus void mission where they would capture special Scout enemies from 3 ships, each gaining new abilities with each ship to make them harder to capture. Succession of the event rewarded Tenno with access to the Grineer Settlement tileset along with 3 dual-stat mods (Mod TT 20pxShred, Mod TT 20pxVigor, Mod TT 20pxLethal Torrent) dependent on how many points were obtained per player (1, 50, 100 points respectively) and also a second holographic badge to commemorate the participation in this event.
Survival Weekend Event
August 30 to September 3, 2013
A special test run to let players test out the new Survival game mode that would replace Raid missions. Awarded the Survival Emblem badge and the WraithStrun Strun Wraith.
The Gradivus Dilemma
October 24 to October 30, 2013
An event focused on special Exterminate missions in locations on Mars that the Grineer and Corpus were competing for control of. Tenno chose to assist a faction of their choice in defeating the other, with special rewards offered by the victorious faction for helping them achieve victory.
The Hunt For Alad V
November 20, 2013
An event that was introduced in Update 11.0. It lasted until the infestation had been cleared. The mission's type was extermination against infested, and the hunt was to make Alad V reveal his position on Jupiter.
The Cicero Crisis
December 19, 2013 to January 6, 2014
An event that was held from December 19, 2013 to January 6, 2014. The Grineer set out to poison the great overgrown forests of Earth. Players were tasked with scanning Earth's flora for ingredients and then creating and injecting antitoxins into the poison-spreading machines. Introduced the Earth jungle tileset.
Operation: Oxium Espionage
January 29 to February 5, 2014
An event released with Update 11.9. Tenno had to hunt for a new Corpus unit, known as an Oxium Osprey, for a new Orokin alloy, Oxium.
Tethra's Doom
March 5 to March 12, 2014
An event released with Update 12.4. The Tenno must stop Councilor Vay Hek and the reforming Fomorian Fleet from dominating the system.
Specters Of Liberty
May 2 to May 8, 2014
An event released with Update 13.2. The Tenno must rescue members of the Red Veil resistance movement that have been captured by the Grineer and the Corpus. This event was the debut of Rescue 2.0.
Operation: Breeding Grounds
June 19 to June 26, 2014 (PC)
August 22 to August 30, 2014 (PS4)
An event released with Update 13.8. It requires players to sabotage the Infested Ship by destroying 3 Infested Hives per ship, with each destroyed hive having various consequences for its destruction, such as increased Infested retaliation. This event was the debut of the Hive Sabotage game mode.
Avalanche Offensive
August 14 to August 17, 2014
Players had to kill 100 Arctic Eximii to be rewarded a 3-Day Affinity Booster.
Operation: Cryotic Front
August 27 to September 3, 2014
This event was the introduction of the Excavation mission type replacing Survival missions on planets. What players had to do was gain 500 points on Earth to obtain access to Phobos and a badge, then gain 1000 points on Phobos to get the Cryotic Mod Pack and obtain access to Europa, where a new Tile Set was introduced. 3000 points earned players the WraithLatron Latron Wraith and the Polar Glaxion Skin.
Operation: Gate Crash
September 17 to September 24, 2014
An event released with Update 14.7. The introduction of the Orokin Sabotage game mode. Awarded the GrineerCombatKnife Sheev dagger and the +120% Slash Damage event mods.
Operation: Mutalist Incursions
November 28 to December 3, 2014 (PC)
December 17 to December 26, 2014 (PS4/XB1)
Players were given four bounties to take care of. Upon completion of the bounties, players unlocked a special survival mission on Eris. Several new infested units were Introduced.
Operation: Eyes of Blight
December 19, 2014 to January 5, 2015 (PC)
February 24 to March 6, 2015 (PS4/XB1)
Released with Update 15.8, this event had Councilor Vay Hek attempt to destroy the newly constructed Tenno Relays, using his fleet of Balor Fomorian ships. In order to stop him, you had to collect Omega Isotopes to build a Fomorian Disruptor that would allow you to take your Archwing into the core of a Balor Fomorian, and destroy it from the inside out. Each core destroyed earned you a point towards a new reward, which included: An Eyes of Blight emblem, an Archwing Mod pack, and the grand prize, the ImperatorVandal Imperator Vandal. While you may have completed a mission, if a certain number of people did not, Councilor Vay Hek would end up destroying a Relay, and moving on to the next.
Operation: False Profit
April 23 to April 29, 2015 (PC)
June 4 to June 11, 2015 (PS4/XB1)
Awarded the QuantaVandal Quanta Vandal and the +120% Impact Damage event mods. Introduced the Bursa MOAs.
Operation: Tubemen of Regor
May 12 to May 20, 2015 (PC)
June 17 to June 25, 2015 (PS4/XB1)
Awarded the KarakWraith Karak Wraith. Introduced the Grineer Sealab tileset.
Operation: Shadow Debt
January 25 to February 3, 2016 (PC)
April 14 to April 22, 2016 (PS4/XB1)
Awarded the VulkarWraith Vulkar Wraith and Scorn Lacera Skin. Introduced the Acolytes as well as the corresponding Acolyte mods.
Operation: Rathuum
April 29 to May 9, 2016 (PC)
June 10 to June 20, 2016 (PS4/XB1)
Awarded the WraithFurax Furax Wraith. Introduced the first arena mission, Rathuum.
Operation: The Pacifism Defect
March 2 to March 9, 2017 (PC)
March 20 to March 27, 2017 (PS4/XB1)
Awarded the IgnisWraith Ignis Wraith (blueprint / built / clan research depending on clan score). Introduced the Defection game mode.
Operation: Ambulas Reborn
May 4 to May 11, 2017 (PC)
May 15 to May 24, 2017 (PS4/XB1)
Awarded the SupraVandal Supra Vandal. Introduced the new version of the Ambulas Boss Fight.
Operation: Plague Star
November 15 to November 27, 2017 (PC)
December 1 to December 18, 2017 (PS4/XB1)
The first event since Update 22.0, featuring bounty missions on the plains. Possible rewards include EtherDaggers2 Ether Daggers, CorpusSniperRifle Snipetron, Mod TT 20pxFulmination, Mod TT 20pxSacrifice, infested Zaw parts, and infested Zaw Exodias.
The Pyrus Project
August 30 to September 13, 2018 (PC)
October 4 to October 18, 2018 (PS4/XB1)
Awarded the Zylok Zylok. Introduced the rebuilt Strata Relay.
Operation: Buried Debts
March 8 to March 25, 2019 (PC)
March 19 to April 3, 2019 (PS4/XB1/Switch)
Awarded the OpticorVandal Opticor Vandal. Introduced the Exploiter Orb Boss Fight in Update 24.5.
Operation: Hostile Mergers
May 22 to June 3, 2019 (PC)
June 11 to June 24, 2019 (PS4/XB1/Switch)
Awarded the SpectraVandal Spectra Vandal and GlaxionVandal Glaxion Vandal. Introduced the Disruption game mode.
Operation: Scarlet Spear
March 24 to April 28, 2020 (PC)
April 9 to May 14, 2020 (PS4/XB1/Switch)
Possible rewards include the BasmuA Basmu, CetiLacera Ceti Lacera, Arcanes, and Stance Forma. Introduced the OpLink.

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