Pamper and spa parties are really popular. You have two choices of where to hold the event. First, many salons host pamper yourself parties at there business. If you are wanting something more private, have them come to your home. Depending on the number of guests, you may have two to three nail techs. I'd ask for professionals that can do nail art like rhinestones and flowers.
If you wish to go all out choose a salon that offers day packages with massage, pedicures and manicures, even facials
For fun, attach mini bottles of fingernail polish to invitations.
You have the makings of a fun event. Wishing you great success.