By LISA CROVO | Photographs by Dan Dion i wanted to believe. I really did. But the truth is, the "X-Files" convention I attended on June 22 and 23 in Portland, Oregon, was dismally disappointing. Call me crazy, but I was expecting to see a freak show. I wanted vampires, flukemen, liver-eating mutants or a least a few mock FBI agents running around. Christ, I think I was the only person wearing a trench coat! What I did see was a fair representation of suburban Portland's adolescent girl population, with a healthy sprinkling of conspiracy-geek types, spinsters and people who need to start getting out on Friday nights. Perhaps they will this fall, if "The X-Files" makes its controversial jump to Sunday night to open a slot for creator Chris Carter's new Fox offering, "Millennium." Nah, probably not. The convention, held at the dreary Holiday Inn Airport in Portland, was divided into three sections: the auditorium, where the presentations and featured speaker addresses were held; the Dealer Room, across a parking lot in an entirely separate locale done up in early '80s pseudo-Polynesian and reeking of bad cafeteria food; and the Prop Gallery. My first stop was the Dealer Room, where I anticipated an overwhelming array of quirky merchandise relating to one of the most popular and certainly the most visually haunting show on television. Instead, I found myself in a dimly lit, low-ceilinged conference room where barely half of the goods for sale had anything to do with "The X-Files." Next: The Cancer Man Interview