Check out raleighgyros.com for a great group that road bike primarily out of Blue Jay Point. There are no membership dues for this group and they have to be some of the nicest people and they are so organized for a group of volunteers; you won't be disappointed and there are quite a few triathletes in the group.
Have you discovered setupevents to find the races?
Amazing number of triathletes and the races fill up fast
I heard the one of the YMCA's (either Wake Forest or Raleigh) have a training club
Best of luck tri-ing