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

### Instruction:
When were the callback auditions at Hilton Riverside Hotel held?

### Inputs:
table_name: table, columns: ['Episode air date', 'Audition city', 'First audition date', 'Audition venue', 'Callback audition date', 'Callback venue', 'Golden tickets']

### Response:
SELECT Callback audition date FROM table WHERE Callback venue = Hilton Riverside Hotel