Chat with the caterer about what your dinner menu will include. What wines do they recommend pairing with the meal? And, what will the bar be composed of? When the timing is right, schedule a tasting so you can get the full experience.
Set up appointments with your florist to see sample centerpieces and discuss all floral decor. She's also a good person to join in on the conversations regarding linens and lighting in an effort to create a cohesive look.
Call your stylist and ask for a trial run.
Have your invitation designer get started on the save-the-dates, stationery concepts and so on and so on.
Some of these items you may touch on during the interviews with the vendors, but once they have been hired on, you can really start working to create the perfect look and feel for your day!