句子不地道，有为语法而语法的毛病。
建议直接改成：
意思如果想说下个月有个摄影展，表达不正确，需要修改:
直接一点:There is a photography show in next month.
如果问时间:When will be the exact time open for the photography show in next month.
The time that the photography show is in next month.(同位语从句)
或者The photography show will start in next month.(简单句)
对
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