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_19 (week INTEGER, attendance VARCHAR)
### Question:
What is the average week number for games that had 28,800 fans in attendance?
### Answer:
SELECT AVG(week) FROM table_name_19 WHERE attendance = "28,800"