Hoi/An/is/held/Although/in the middle of/the/biggest/one/in/Lantern Festival/each month/takes place/Tet holiday

The Lantern Festival, which is the biggest one, occurs during Tet holiday despite smaller festivals being held monthly.

In the middle of each month, there is a Lantern Festival held, but the most notable one is during Tet holiday.

The biggest Lantern Festival is held during Tet holiday, even though there are smaller ones throughout the year.

Although the Lantern Festival is held in the middle of each month, the biggest one takes place during Tet holiday.