Welcome the harvest year and celebrate the Spring Festival. That is the first couplet.

Neither.

The pronunciations of Nian and Festival are both Yangping tone and Ping tone. In the tradition of couplets, the last character of the first couplet is Oblique tone and the last character of the second couplet is Ping tone. Therefore, everyone celebrates the harvest year and celebrates the Spring Festival. Not the first couplet.

Couplets, also called Spring Festival couplets, are divided into upper and lower couplets. They are neatly contrasted and harmonious. They are a unique art form in Chinese and a traditional Chinese cultural symbol.