Final answer:
Leah's family is observing Yom Kippur, a day of fasting and prayer in the Jewish religion, typically observed in September or October.
Step-by-step explanation:
Leah's family is most likely preparing for Yom Kippur. Yom Kippur, also known as the Day of Atonement, is the holiest day in the Jewish calendar, typically observed with a 25-hour period of fasting and intensive prayer. It falls in September or October, according to the Gregorian calendar, and it involves various traditions such as closing businesses and refraining from work to focus on repentance.