What customs of the Dragon Boat Festival are described in Yu Guangzhong's Soul-Evocation Poem? Why write about these customs of Dragon Boat Festival?

It was written in praise of the patriotic poet Qu Yuan. With the traditional Dragon Boat Festival order, pay tribute to and cherish the memory of Qu Yuan, and express Mr. Yu's own sustenance for his motherland, homeland, homesickness and old friends. Qu Yuan's spirit is independent, just like Mr. Yu's feelings; Qu Yuan's insistence on his inner will and personal integrity is just like Mr. Yu's insistence on expressing his ambition in words.