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_20 (venue VARCHAR, notes VARCHAR, year VARCHAR)
### Question:
Which Venue has a Notes of heptathlon, and a Year of 1991?
### Answer:
SELECT venue FROM table_name_20 WHERE notes = "heptathlon" AND year = 1991