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 Participants_in_Events (Event_ID VARCHAR)
### Question:
What is the id of the event with the most participants?
### Answer:
SELECT Event_ID FROM Participants_in_Events GROUP BY Event_ID ORDER BY COUNT(*) DESC LIMIT 1