YOU SAID:

I am standing in the bathroom at the biggest party of the fall

INTO JAPANESE

私は秋の最大のパーティーで浴室に立っています

BACK INTO ENGLISH

I am standing in the bathroom with the biggest party in autumn

INTO JAPANESE

私は秋に最大のパーティーで浴室に立っています

BACK INTO ENGLISH

I am standing in the bathroom with the biggest party in the fall

INTO JAPANESE

私は秋に最大のパーティーと一緒に浴室に立っています

BACK INTO ENGLISH

I am standing in the bathroom with the biggest party in the fall