Rally is a type of Gathering. Rally is related to Protest. Protest is related to Involved. 
Build is related to Sand. Sand is related to Substance. Substance is related to Soap. Soap is related to Item. 
Gathering <--IsA-- Rally <--RelatedTo--> Protest <--RelatedTo--> Involved 
Build <--RelatedTo--> Sand <--RelatedTo--> Substance <--RelatedTo--> Soap <--RelatedTo--> Item 