Music can be Contemporary. Music is the opposite of Silent. 
Christmas is the opposite of Summer. Summer is related to Rain. Rain is related to Product. you are likely to find Product in/at/on Demonstration. 
Contemporary <--HasProperty-- Music <--Antonym--> Silent 
Christmas <--Antonym--> Summer <--RelatedTo--> Rain <--RelatedTo--> Product --AtLocation--> Demonstration 