you would Celebrate because Alive. Alive is related to Plant. 
Drift is a type of Force. Force is related to Extreme. Extreme is the opposite of Moderate. Moderate is related to Mild. 
Celebrate --MotivatedByGoal--> Alive <--RelatedTo--> Plant 
Drift --IsA--> Force <--RelatedTo--> Extreme <--Antonym--> Moderate <--RelatedTo--> Mild 