Final answer:
Elizabeth is embarrassed by Marjorie's neglect at a social event, Mr. Collins's unpleasant manner after a proposal discussion, and Draycott Deyo's reaction to her lighthearted greeting at a dance.
Step-by-step explanation:
The three people who embarrass Elizabeth over the course of the evening are Marjorie, Mr. Collins, and Draycott Deyo. Marjorie embarrasses Elizabeth by becoming preoccupied with a boy at a social event, leaving Elizabeth to make a lackluster attempt at entertaining the remaining guests. Mr. Collins contributes to Elizabeth's discomfort with his stiff mannerisms and resentful silence after discussing a proposition that results in unpleasant feelings for her. Lastly, Draycott Deyo embarrasses Elizabeth by having an unexpected reaction to her playful greeting. Elizabeth's attempt to be humorous by saying "Hello, Shell Shock!" and continuing with a bathtub story is met with awkwardness, as he had cut in on her, assuming she was a quiet and reserved girl.