Welcome Stephen!
If you haven't, check out the Shooting Sports subforum for match information, discussion, and some stickies that try to provide an overview of what to expect in shooting competition.
As you mentioned IDPA and steel shoots, there are a few upcoming matches that you may be interested in:
IDPA is held twice a month: 2nd Saturday at Nampa and 4th Saturday at Parma. Both put on quality matches. Start time during the summer is usually 0900 hrs. Fee: $10/shooter.
Steel Challenge is held twice a week: Monday nights at Nampa and Tuesday nights at Emmett. Both typically start around 1800 hrs, and last until 1930 or so. Fee: $5/shooter.
Hell, while you're at it, may as well give USPSA a try. Three matches a month at Nampa, Parma, and Emmett.
Come check it out!