Each year in September, a community festival celebrates the return of the salmon.

每年九月，为了庆祝鲑鱼的回归，会举办一个社区性的庆典。

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Software Freedom Day happens in September each year.

软件自由日每年9月来临。

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The rate is set each year in March, which means that the interest rate prevailing in the academic year beginning in September will, in theory, be -0.4%-a transfer from state to student.

这项利率在每年3月设定，这意味着始于9月份的学年的利率在理论上是- 0.4%，即从国家转移到学生头上。

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Each year, the Arctic sea ice reaches its minimum extent in September.

UNESCO: EDUCATION

Sacra Profanum, run by Filip Berkowicz, also artistic director of Misteria Paschalia, is an innovative new music festival that takes place in September, taking a different country as its theme each year.

BBC: Musical destinations: Krak��w, Poland

Each year we recognize September 17 as Constitution Day and Citizenship Day, to commemorate the signing of the Constitution in Philadelphia in 1787.

WHITEHOUSE: Celebrating Citizenship Day by Welcoming New Americans