you are likely to find Information in/at/on Demonstration. you are likely to find Demonstration in/at/on Class. Class is related to Travel. Seek is a type of Travel. 
Glad is the opposite of Depressed. 
Information --AtLocation--> Demonstration --AtLocation--> Class <--RelatedTo--> Travel <--IsA-- Seek 
Glad <--Antonym--> Depressed 