Final answer:
The transition from the informal atmosphere in the Teddy Bears Picnic to the formal atmosphere in West Minister and the City can be described as cultural contrast.
Step-by-step explanation:
The term that can be used to describe the transition from the informal atmosphere in the Teddy Bears Picnic to the formal atmosphere in West Minister and the City is cultural contrast.
Cultural contrast refers to the differences in customs, behaviors, and ways of life between different groups or societies. In this case, the informal atmosphere at the picnic represents a relaxed, casual gathering, while the formal atmosphere in West Minister and the City signifies a more serious and structured environment.