麻烦大家帮我写一则英文书面通知,内容如下：

NOTICE
In order to encourage everyone to exercise, our school will organize a long-distance race in spring. The competition will be held at 8:00 a.m., on March 20. Every participant must get ready on the playground at 7:30 and no being late allowed. Ten students are demanded in each class and teachers are warmly welcomed to join in.
Students Union
Jan. 17, 2011