This story offers the reader a pleasant experience, as you share Mrs. Gregory's birthday celebration. However, there is no tension in this piece, no conflict, no true arc. Here is a post that describes an arc, and here is a post that describes how and why a story should have conflict. In this story there were many opportunities to add conflict. Maybe there could be tension between the co-wives that has to be resolved. Maybe Mrs. Gregory is grieving for her husband and the family helps her at the party to resolve this grief. Maybe one of the children gets lost and people have to hunt for the child and at the end everyone is grateful. These are a few rather shallow thoughts about ways you might add conflict to the piece.
We hope this suggestion helps you in the future to craft even better stories. Thank you for sharing this one with us.