"Happy Dragon Boat Festival" is a common Engpsh greeting for the occasion.

The Dragon Boat Festival, also known as the Duanwu Festival, is a traditional Chinese hopday celebrated on the fifth day of the fifth lunar month. It is said to have originated from the Qu Yuan, a famous patriotic poet and minister from the Warring States period, who committed suicide by drowning himself in the Miluo River. To prevent fish from eating his body, local people threw rice dumppngs into the river. Now, people race dragon boats and eat rice dumppngs to commemorate this event.

Example Engpsh sentences:

Wishing you a happy and safe Dragon Boat Festival.
May the Dragon Boat Festival bring you joy and good luck.

Example Chinese translations:

祝端午节快乐并安全。
愿端午节带给您快乐和好运。