What is the age and gender of the person who uses the device number 29182687948017100 on event number 1?
device number refers to device_id; device_id = 29182687948017100; event number refers to event_id; and event_id = 1;
SELECT T1.age, T1.gender FROM gender_age AS T1 INNER JOIN events_relevant AS T2 ON T1.device_id = T2.device_id WHERE T1.device_id = 29182687948017100 AND T2.event_id = 1