K.,
I would be really careful with this. Girls at your daughter's age are VERY sensitive, and you run the risk of her feeling uncomfortable or embarassed, depending upon who is invited to her "celebration". If you decide to go ahead with it, I'd try to find a way to work around to getting her feelings on that kind of thing beforehand.
One idea I put forth to another Mom was a bit more of a private celebration. You may want to take her on a special shopping expedition for all of these items, get her fitted for a bra if she's ready and not yet wearing one, some "grown up" panties, etc. Then spend the afternoon at a salon getting her hair and nails done, maybe take her to lunch someplace sophisticated and special.
I totally understand how you'd want to mark your daughter's entry to womanhood, and make the experience special and memorable for her. It's so important that she view the changes in her body in a positive light. I just wonder how she'd react to being at a table with her girlfriends, or her grandmother (even worse, depending on Grandma!) and opening a box full of maxi-pads, Midol, and acne medicine. I remember adolescence, and I would have wished for immediate death, just to escape the moment. I was very shy at that age. Of course, your daughter may be thrilled, or find the whole experience hysterically funny. It all depends on her personality.
Jess