求翻译：如果有兴趣的同学请在2011年9月19日下午3点到5点之前将名字和演讲话题上报给班长比赛地点是学校活动中心报名截止时间是2011年8月31日是什么意思？

If students are interested in at 15:00 on September 19th, 2011 to 5:00 and the lecture topic before the name of the venue is reported to the monitor center of school activities Registration deadline is August 31, 2011

If you are interested in the students' requests September 19, 2011 at 3:00 p.m. to 5:00 will be preceded by name, and lecture topic is handed over to the competition will take place at his squad School Activities Center would be closed August 31, 2011

If has interest schoolmate please in September 19, 2011 in the afternoon 3 o'clock to 5 o'clock in front of compete the place the name and lecture topic reporting for class leader is the school activity center registration cut-off time is on August 31, 2011

Student if you are interested in, on September 19, 2011 to 3 o'clock in the afternoon before the name and presentation topics reported to monitor place school activities Center application deadline is August 31, 2011

Interested classmates September 19, 2011, to names before and lecture topics reported to monitor school activities centre venue was closing time is August 31, 2011