Hi Michael,
Pizzafari in Disney's Animal Kingdom Theme Park is a great choice for a big group to enjoy dining together! There are multiple "dining rooms" with ample seating available. We always travel with a large group and have had good luck finding seats together there. To increase your chances of sitting together, I recommend that you choose an "off" time to eat. For example, after 1:30 PM is often less crowded than the lunch rush from 11 AM - 1 PM.
In answer to your question, yes, Pizzafari can accommodate a dairy allergy. In fact, if you view their
online menu, and scroll down a bit, you will see their "Milk Allergy-friendly Menu Options". They have several options made with "milk-alternative cheese". If you prefer not to have any cheese (milk-alternative or not), simply inform the Cast Member taking your order that you want a pizza without any cheese.
Please let us know if we can assist you further.
Wishing you magical memories,
Kaylene