Joe Dudman started running road races as a sophomore in high school, circa 1980. Since that time he has accumulated over 540 race T-shirts (Yes, he finally got around to counting them!) Some of them evoke special memories and (hopefully) interesting stories. In this recurring series, he recounts some of them for Run Oregon readers. My first and so far only duathlon (despite the name, this event consisted of running and cycling, NOT running and…