Solstice (called Solstice of Heroes until 2022) is an annual summer event that runs from July to August. Players are given an armor set and throughout the event, upgrade it to become a viable armor set for players to use. This event's featured activity during Years 2 to 4 was the European Aerial Zone (EAZ). In this activity, a team of three players had a set time to battle Hive, Cabal, or Fallen foes and hunt mini-bosses throughout the space, with a final boss appearing after the time has expired. Several hidden chests also appeared throughout the space after defeating the final boss. Year 5 introduced a new activity called Bonfire Bash to replace the EAZ activity although the event takes place in the same EAZ location. A team of three players have a set time to face Taken enemies, as well as Hive, Cabal, or Fallen enemies to obtain igniters to light up a large bonfire at the center of the EAZ map, with a final boss appearing after time has expired. Completing this activity, as well as other activities, are required to upgrade the event's armor set.
