Easter Sunday and Monday
Ramadan • رمضان
Ugadi is New Year's Day for the states of Andhra Pradesh, Telangana, and Karnataka in India. https://en.wikipedia.org/wiki/Ugadi
Eid al-Fitr • عيد الفطر is 13 May (may differ ±1 day dependent on sighting of lunar crescent). The first day is observed.
Eid al-Adha • عيد الأضحى. The first two days are observed.
Rosh Hashanah • ראש השנה is sunset through nightfall.
Yom Kippur • יוֹם כִּיפּוּר is nightfall the first day and all day the second day.
Diwali (or Deepawali) is observed on the first two days: 4th for the south and 5th for the north (generally).
The Thursday is the observed Thanksgiving Day and the following Friday is typically also taken off. Many in USA will travel during the four-day weekend.