Occasion is related to Ceremony. Ritual is a type of Ceremony. Marriage is a type of Ritual. Marriage is related to Divorce. 
you are likely to find Horse in/at/on History. Horse is related to Big. Big is similar to Senior. Senior is the opposite of Junior. 
Occasion <--RelatedTo--> Ceremony <--IsA-- Ritual <--IsA-- Marriage <--RelatedTo--> Divorce 
History <--AtLocation-- Horse <--RelatedTo--> Big <--SimilarTo--> Senior <--Antonym--> Junior 