I agree with Norm about not missing "Formal night". It is very nice and a nice dress, pant suit, skirt and dressy blouse would be acceptable. DH could wear a suit for a couple of hours and enjoy the evening dinner.
I also agree with jim130. There is no restrictions anywhere on the ship on formal nights if you are dressed casually. I am not too sure what Norm is talking about when he says:
Princess also holds very classy special events on these evenings that I won't describe because I don't want to spoil the surprise.
Nothing special was done on my last couple of Princess cruises. Then again, maybe I just forgot about it.
Teresa and Larry
#36-Carnival Splendor 9/16/12
7 night Mexican Riviera
#37-Allure of the Seas 11/11/12
7 night Eastern Caribbean
#38-Celebrity Solstice 4/8/13
17 night Tahiti -- Sydney-Honolulu
40th Anniversary Celebration
270 days at see; soon to be 302