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

### Instruction:
On what date was Motherwell the opponent at Fir Park?

### Inputs:
table_name: table, columns: ['Date', 'Round', 'Opponent', 'Venue', 'Result', 'Attendance']

### Response:
SELECT Date FROM table WHERE Opponent = motherwell AND Venue = fir park