In select montly events, extra event challenges will be available to players who belong to a Clan. These Clan Challenges are distinguishable by their green border and special icons.
Depending on the event, Clan Challenges can have 2 different types: Solo or Group.
Clan Solo event challenges count your progress alone. You will need to belong to a Clan to see them, but your Clans activities have no effect on your progress in these types of Challenges.
Clan Group event challenges will count the efforts of all members of your Clan towards the ultimate goal!