Based on the search results, there is no Muslim festival tomorrow. However, there are several upcoming Islamic holidays in the year 2023, including:

• Eid ul Fitr: Celebrated at the end of Ramadan, this holiday commemorates the completion of the month of fasting and lasts for three days.
• Hajj: This is the annual Islamic pilgrimage to Mecca, which takes place during the Islamic month of Dhu al-Hijjah.
• Eid al Adha: Also known as the Feast of Sacrifice, this holiday commemorates the willingness of Ibrahim (Abraham) to sacrifice his son as an act of obedience to God.

It is worth noting that the dates of Islamic holidays vary each year because the Islamic calendar is based on the cycles of the moon, and the dates of some festivals may depend on the actual sighting of the moon.