Ok is the opposite of Sick. Sick is a synonym of Mad. Mad is related to Being. Being is related to Class. 
you are likely to find People in/at/on Wedding. you are likely to find Photographer in/at/on Wedding. 
Ok <--Antonym--> Sick <--Synonym--> Mad <--RelatedTo--> Being <--RelatedTo--> Class 
People --AtLocation--> Wedding <--AtLocation-- Photographer 