What was the festival when the flower market was as bright as day last January?

"Last year's Lantern Festival, the flower market was full of lights" is the Lantern Festival, which comes from Yuan Xi written by Ouyang Xiu in the Song Dynasty. The whole poem is as follows:

On the fifteenth day of the first lunar month, the flower market is brightly lit.

At the end of the month, it is about dusk.

On the Lantern Festival on the fifteenth day of the first month of this year, the moonlight and lights are still the same as last year.

I will never see my old friend last year again, and my tears are soaked through my clothes.