Based on the novel The Lekki Headmaster, why do some teachers at Stardom Schools dread Open Day?

Some teachers at Stardom Schools dread Open Day because parents often come with complaints. Open Day is an event where parents visit the school to meet teachers, review their children's academic progress, and discuss any concerns. For teachers, this can be a stressful occasion because parents may raise criticisms about teaching methods, academic results, student welfare, or other grievances.

The novel shows that the relationship between parents and teachers at Stardom is sometimes tense. Parents who are paying significant school fees have high expectations, and Open Day becomes the occasion when those expectations collide with reality. Teachers feel vulnerable to criticism and, as the Mr. Fafore incident demonstrates, even to the loss of their jobs if a parent's complaint is taken seriously by the school's management.

The other reasons listed are not what the novel identifies. The teachers are not specifically afraid of being sacked on Open Day (though the Fafore incident later reinforces that fear), they do not generally dislike interacting with parents, and the dread is not about long working hours. It is the complaints themselves that make the day unwelcome.