Can you list the events that have participents whose details had the substring 'Dr.'?
SELECT T2.event_id FROM participants AS T1 JOIN Participants_in_Events AS T2 ON T1.Participant_ID   =   T2.Participant_ID WHERE T1.participant_details LIKE '%Dr.%'
events with participants having details with 'Dr.' = JOIN on participants and Participants_in_Events tables and WHERE clause with LIKE '%Dr.%';