2021

== Halo universe ==
*The International Society of Civil Engineers is established on Earth.Halo 3, level Orbital
== Real world ==
=== June ===
The Halo Infinite multiplayer is first revealed.
=== July ===
The first Halo Infinite tech preview releases.
=== September ===
The second Halo Infinite tech preview releases.
=== November ===
Halo Infinite surprise releases on the 15th to celebrate Halos 20th anniversary. 
Fracture: Tenrai Week 1 happens.
== December ==
Halo Infinite fully releases.
The Winter Contingency event starts.
==Sources==