Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Venue has a Notes of heptathlon, and a Year of 1991?

### Inputs:
table_name: table, columns: ['Year', 'Competition', 'Venue', 'Position', 'Notes']

### Response:
SELECT Venue FROM table WHERE Notes = heptathlon AND Year = 1991