I know several people called and found out when the formal evening is, but I just got this in an email from disney about our cruise:
"Your voyage does not include any formal evenings. However, if you'll be dining in one of our adults-only restaurants, we recommend a dress or pantsuit for women and a jacket and tie for men. You may also want to consider a tux, which is available for rental during your cruise."
Just thought I would share. I would hate to purchase dresses and rents tuxes and then find out it wasn't necessary.
Julie W.
Redwood City, CA