Day is related to Unit. Unit is related to Course. 
one thing you do when you Cooking is Spill. Cooking requires Spoon. Spoon is a type of Container. you are likely to find Food in/at/on Container. 
Day <--RelatedTo--> Unit <--RelatedTo--> Course 
Spill <--HasSubevent-- Cooking --HasPrerequisite--> Spoon --IsA--> Container <--AtLocation-- Food 