Suggestion

Correction

I attended a wedding

Many Chinese people consider May is a nice month, since the weather turns warm. There is no cold wind and compare it to summer, it is not as hot or rainy.
Last sunday, I went to a wedding party and there were lots of people. Half of the people were the groom's relatives and friends and the others were the bride's. At first, a movie was played, which showed how the wedding couple first met. Then, the groom sang a song for the bride to show he would love her forever. Afterwards,

Third, five boys took a red line, the wedding ring at one end, groom at the other end, the boys who took red line stand in a line, wedding ring crossed the red line came to groom's hands, and then bride wore the ring by groom...( the process was too long, I got tired...) not really sure what you are trying to describe here

Otherwise I hope you ad a wonderful time at the wedding, and best wishes to the wedding couple.