The four sentences that contain key details for a summary of "The New Year’s Tradition" are:
- "At the start of each year, the store displayed a magical winter scene in its enormous front window."
- "The tradition began with the store's original owner, Margot Thistle, in her desire to keep the hope and excitement of the New Year alive."
- "However, Margot's daughter began to skimp on costs."
- "Margot eventually took back control of the store from her daughter."
These sentences capture the essence of the tradition, the changes made by Margot's daughter, and Margot's return to restore the store.