Attack is related to Campaign. Campaign is a synonym of Movement. one thing you do when you Dancing is Movement. Dancing can cause/lead to Exercise. 
Session is a type of Conference. Session is related to Lesson. Lesson is related to Course. Course is related to River. 
Attack <--RelatedTo--> Campaign <--Synonym--> Movement <--HasSubevent-- Dancing --Causes--> Exercise 
Conference <--IsA-- Session <--RelatedTo--> Lesson <--RelatedTo--> Course <--RelatedTo--> River 