Summary
The story opens with the narrator's description of his home and neighborhood (a description where we first see Joyce's use of the close first-person narrator to convey the full sensory range of sensory detail - sights, smells, colors, textures - that comprise the setting), but the action doesn't begin in earnest until Mangan's sister appears on the doorstep of her house, and the narrator begins to describe his obsession with her. It is a vivid, powerful obsession, befitting a boy on the verge of puberty, and the narrator describes how the girl's 'name was like a summons to all [his]foolish blood,' and how his 'body was like a harp and her words and gestures?like fingers running upon the wires.'
With the obsession established, the story then moves to how the narrator might act on that obsession, how he might obtain this young girl. One night, he meets her on the doorstep of her home. She asks whether he's attending the following Saturday's bazaar (the name of the bazaar is 'Araby'), and expresses her own wish to go, but says, regretfully, she must attend an event for her convent. There is no indication that the narrator, before this moment, intended to go to the bazaar, or was even aware of it, but at that moment he decides he will go, and tells Mangan's sister that he will bring her back a gift from it.
The rest of the story, then, is the narrator's attempt to obtain that gift for Mangan's sister. In fact, his obsession with the girl herself transfers to an obsession with the gift, and with the bazaar where he'll find the gift, so that for the days leading up the bazaar he can think of nothing but getting there. He begins to ignore his schoolwork, is unable to sit still.
Unfortunately, when the day of the bazaar arrives, the narrator's uncle (who was supposed to give him money for the gift), forgets his obligation and arrives home late from work. As a result, the narrator sets out too late. By the time he arrives at the bazaar, 'nearly all the stalls [are] closed and the greater part of the hall [is] in darkness.' He describes the empty place as having 'a silence like that which pervades a church after a service.' While he does find an open stall, any wares that he would buy seem uninviting, or else intimidating (all we know is that he chooses not to buy them). The story ends with the lights in the hall turning off, and with the narrator 'gazing up into the darkness and[seeing himself] as a creature driven and derided by vanity?[his] eyes [burning] with anguish and anger.'