You can purchase baby greens at your supermarket or better yet, if you have access to a local farmers market, select from the many varieties of baby lettuces and greens for your salad. I wash my greens under cold running water and then dry them in a
salad spinner.
The "OXO" salad spinner is a dream. It turns "making a salad" a snap! You can rinse and spin your greens the morning of the party and store them in the fridge until you are ready to dress and serve the salad.