Eid al-Adha, the Festival of Sacrifice, falls on 10 Dhu al-Hijjah during the Hajj pilgrimage. It remembers Abraham's willingness to sacrifice his son and is the larger of the two Eids.
Dates follow the Umm al-Qura calendar and can differ by a day where you live.
No. Eid al-Adha is not a federal holiday in the US, so government offices, banks and schools follow their normal schedule unless they choose otherwise.
Why does the date of Eid al-Adha change each year?
It follows the Islamic calendar of 12 lunar months, about 11 days shorter than the solar year, so it moves about 11 days earlier every year.