this takes place in May every year,

问题描述:

this takes place in May every year,
walk to school week 2009 was May 18th-22nd,2009 and theme is "walking together",the dates for walk to school week 2010 is May 17th-21st
如何翻译?

这每年在五月份举行,2009步行去上学周于2009年5月18-22号举行,主题是“一起步行”,2010步行去上学周会在2010年5月17-21号举行