Final answer:
The reference does not specifically state what Harry did not put on his plate. However, characters in literature often avoid certain foods based on personal preferences, just as people do in real life.
Step-by-step explanation:
At the first feast, Harry did not load everything on his plate, although the reference provides various foods that were available at feasts or gatherings in different contexts.
We do not have specific details about what Harry chose not to include on his plate from the provided texts. However, one could imagine Harry might choose not to take something he was unfamiliar with or didn't like, much like any person at a feast might avoid certain dishes.
In literature, characters often have preferences or aversions that reflect their personality, background, or the culture of the world they inhabit, leading to choices that help define their character.