Openings and closings. Re-inventings and re-hashings. Clubdom is reeling like a Detroit car company. Now Plumm, Noel Ashman's three-year-old celeb boite, is expanding to accommodate its celebrity crowd -- they need a bigger place but don't want to go anywhere. I caught up with Noel in the unused Plumm basement lounge while Saturday night raged up above. I was rather surprised as I was being whisked to Noel's table -- not only was the place packed, but the crowd was hot. Not "three years ago hot," but better than the other places I was hitting that night. A steady stream of hip hop treats led me to Noel's table, only to realize that he wasn't there. I glanced up to see who was playing, and there he was: DJ Ashman. Noel offered two more tunes, and we headed downstairs to see what could be done.