Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_45 (date VARCHAR, site VARCHAR, opponent VARCHAR)
### Question:
What is the Date at memorial stadium • minneapolis, mn, and an Opponent of northwestern?
### Answer:
SELECT date FROM table_name_45 WHERE site = "memorial stadium • minneapolis, mn" AND opponent = "northwestern"