Final answer:
Homer Barron is in town as the foreman of the construction crew building the town gazebo.
Step-by-step explanation:
Homer Barron is in town because he is the foreman of the construction crew that is building the town gazebo. This is evident from the passage that mentions the construction noises and the new barn being built. It also states that Adeniran received a letter from Hiram about the opportunity to buy a horse, implying that Homer Barron is in town for work and not for personal reasons or events such as responding to a letter or attending a funeral.