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_57 (year INTEGER, category VARCHAR, nominated_for VARCHAR)
### Question:
Name the year that Birds of a feather category for most popular actress was nominated
### Answer:
SELECT AVG(year) FROM table_name_57 WHERE category = "most popular actress" AND nominated_for = "birds of a feather"