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

### Instruction:
When is Country of united states, and a Venue of mandalay bay resort in?

### Inputs:
table_name: table, columns: ['Date', 'City', 'Country', 'Venue', 'Attendance']

### Response:
SELECT Date FROM table WHERE Country = united states AND Venue = mandalay bay resort