2 sentences

1. 五月一号是劳动节。

   wǔ​yuè yī​hào shì láo​dòng​jié.

   May 1 is Labor Day.

   Source: CCMatrix

2. 愚人节是在每年的四月一号。

   yú​rén​jié shì zài měi​nián de sì​yuè yī​hào.

   April Fools' Day is on the first of April every year.

   Source: CCMatrix