Do you remember when you did something for the first time? I have one really strong memory from about four or five years back when I was with my best friend at the "FaceToFace" club. This club was closed for a few years and that night was opened just for one huge rave party. Before that party, I wasn't so much party type of guy. That event totally changed my view of what rave/techno culture was.
In the last few years I was in a lot of techno venues but the memories from that party will be one of the strongest frvr.