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 EVENTS (event_id VARCHAR); CREATE TABLE Participants_in_Events (event_id VARCHAR)
### Question:
How many events did not have any participants?
### Answer:
SELECT COUNT(*) FROM EVENTS WHERE NOT event_id IN (SELECT event_id FROM Participants_in_Events)