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行われる， 行なわれる， おこなわれる
1. to be done, to be practiced, to be practised, to take place, to be held, to be prevalent, to be in fashion, to be in vogue, to be current, to come into use
（被）举行，举办；实施、盛行、流行起来、正在流行、开始使用
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
