Percy is attempting to study for his exam with Mr. Dodds, the math teacher who attacked Percy in the museum. He hears Mr. Brunner say that Percy needs to "'mature more,'" and Grover mentions something about a deadline at the summer solstice.
This phenomenon is better explained by mass hysteria
Explanation:
Mass hysteria is a phenomenon whereby false information rapidly permeates among many people in the society or environment as a result of suspicion, rumors and fears caused by environmental, political, or other types of unfortunate incidences. In many instances, whenever there is mass hysteria, there is also a collective illusion about threats that don’t actually exist. The term “mass hysteria”—associated with masses of people—is also known by other names such as group hysteria, collective hysteria, mass psychogenic illness, or collective obsessional behavior.