Fall and winter celebrations, such as Rosh Hashanah, Yom Kippur, Halloween, Día de los Muertos, Navratri, Diwali, Thanksgiving, Día de la Virgen de Guadalupe, Hanukah, Kwanzaa, Christmas, and New Year’s, typically include large gatherings of families and friends, crowded parties, and travel that may put people at increased risk for COVID-19.