The 29th Olympic Game was such a big sports festival.这句话有一个错误,错在哪里?要有它错误的理由

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The 29th Olympic Game was such a big sports festival.这句话有一个错误,错在哪里?要有它错误的理由

The 29th Olympic Games were such big sports festivals
运动会是多项运动的集合,是复数概念