How does Jackson lull us into thinking that "The Lottery" is just an ordinary story with an ordinary town?

In "The Lottery," Jackson lulls us into thinking that this is an ordinary town through her descriptions in the opening few paragraphs. It is an ordinary summer day, for example, and the townspeople gather in the square as if they are preparing for any ordinary civic event. The children are relaxed and busily playing while the parents gossip and chat, as though it is an ordinary day:

Soon the men began to gather, surveying their own children, speaking of planting and rain, tractors and taxes.

Secondly, Jackson also lulls us into thinking that this is an ordinary story by withholding the climax - in which Tessie Hutchinson is stoned - until the very end of the story. This sudden twist in the plot is thus a great surprise to the reader because until this point, the reader had no reason to suspect that this lottery was any different from any other kind.