Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_4 (date VARCHAR, event VARCHAR, acts VARCHAR, year VARCHAR)
### Question:
Tell me the date for acts of 6 bands and year larger than 1981 for monsters of rock
### Answer:
SELECT date FROM table_name_4 WHERE acts = "6 bands" AND year > 1981 AND event = "monsters of rock"