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_27 (events INTEGER, top_5 VARCHAR, top_10 VARCHAR, tournament VARCHAR)
### Question:
What is the average number of events of PGA Championship tournaments with a top-5 less than 0?
### Answer:
SELECT AVG(events) FROM table_name_27 WHERE top_10 = 0 AND tournament = "pga championship" AND top_5 < 0