回答
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"The school festival scheduled for September."
- "The school festival scheduled for September."
"the school festival" 「文化祭」
"scheduled for ~" 「〜に控えた」"planned for ~" も使えます
"september" 「9月
"The school festival that is scheduled for September." も言えます。"that is" を付けても付けなくても大丈夫です。