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

### Instruction:
Tell me the date for acts of 6 bands and year larger than 1981 for monsters of rock

### Inputs:
table_name: table, columns: ['Year', 'Date', 'Event', 'Days', 'Stages', 'Acts']

### Response:
SELECT Date FROM table WHERE Acts = 6 bands AND Year > 1981 AND Event = monsters of rock