The co-op itself requires that you grow two crops, Green Tea and Sugar Cane. You’ll need 1,000 Green Tea and 250 Sugar Cane in all for the mission to be a success, but while that doesn’t seem like that hard of a task, your time limit here is a very short one, at two days total. If you can mange to complete the job in under 18 hours and 59 minutes, you’ll receive the Gold Medal and the Tea Party item as a reward, along with coins and experience points.
For this co-op, you’ll need to be a certain level to both start or join it. To start the co-op, you’ll need to be at least level 31, while those who wish to join in the co-op must be at least level 28.
Do you fulfill those level requirements? Head over to the game’s page to start your own Tea Party job, or make sure to look and see what co-ops your friends are currently running.