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 (Participant_ID VARCHAR, participant_details VARCHAR); CREATE TABLE Participants_in_Events (Participant_ID VARCHAR)
### Question:
How many events had participants whose details had the substring 'Dr.'
### Answer:
SELECT COUNT(*) FROM participants AS T1 JOIN Participants_in_Events AS T2 ON T1.Participant_ID = T2.Participant_ID WHERE T1.participant_details LIKE '%Dr.%'