Activity is related to Call. Call is a type of Stop. Stop is a synonym of Catch. Catch is a synonym of Haul. 
Gathering is related to Camp. Camp is related to Outdoor. 
Activity <--RelatedTo--> Call --IsA--> Stop <--Synonym--> Catch <--Synonym--> Haul 
Gathering <--RelatedTo--> Camp <--RelatedTo--> Outdoor 