Date & Time: June 7th (update 6.15)
Frequency: Tribal quest interactions
Area and coordinates: observed at Arkasodara and Vanu tribes
Splash screens for tribal quests still show "Beast Tribe" despite fixes in 6.15 to change them to Tribal quests..
Including; Beast Tribe Quests Unlocked, Beast tribe Quest Accepted, Beast tribe Quest Completed.
https://i.imgur.com/GmJ9UbO.png