YOU SAID:
I need to do laundry over the weekend.
INTO JAPANESE
私は週末に洗濯が必要です。
BACK INTO ENGLISH
I need the laundry at the weekend.
INTO JAPANESE
私は週末に洗濯が必要です。
BACK INTO ENGLISH
I need the laundry at the weekend.
That didn't even make that much sense in English.