Day and night are as cool as water. What festival is morning glory and Vega?

"The day and night are as cool as water, lying and watching the morning glory and Vega" is Tanabata.

This poem is from Autumn Night written by Du Mu in Tang Dynasty.

In the autumn night, candlelight reflected the screen, and Fan slapped the fireflies with his hand.

The stone steps at night are as cold as cold water, sitting and staring at the cowherd and the weaver girl.

Valentine's Day in China is the seventh day of the seventh lunar month. Also known as Qiaoqi Festival, Qiaoqi Festival or Chinese Valentine's Day, it began in the Han Dynasty and is a traditional cultural festival popular in China and other countries in the Chinese character cultural circle. According to legend, on the night of the seventh or sixth day of the seventh lunar month, women begged the Weaver girl for cleverness in the courtyard, so they called it "begging for cleverness". It originated from the worship of nature and women's embroidery, and was later given the legend of cowherd and weaver girl, becoming one of the most romantic festivals. The festival produced activities such as needlework embroidery, praying for the reed hand, worshiping Seven Sisters, displaying flowers and fruits, needlework and so on, and spread far and wide to Japan, Korean Peninsula, Vietnam and other countries with Chinese character cultural circles.

On May 20th, 2006, China Valentine's Day was approved by the State Council to be included in the first batch of national intangible cultural heritage list. In recent years, due to the influence of foreign cultures, foreign festivals have gradually become popular in China, and the media hype has led to the cultural meaning of Valentine's Day in China as "Valentine's Day in China".