Based on the search results, it is not possible to determine which Islamic holiday Muslims are celebrating today. However, Islam has two official holidays: Eid Al-Fitr and Eid Al-Adha. Eid Al-Fitr is celebrated at the end of the month of Ramadan, whereas Eid Al-Adha lands on the 10th day of Dhu al-Hijjah (the final month of the Islamic calendar) . It is worth noting that Shia and Sunni Muslims do not celebrate the same holiday schedule, and that practices vary by nation.