Formal nights: I, like members of your family, own one suit and have owned that one suit for 10 years +!!! I hemmed and hawed about participating in formal night, but of course my wife won out on that one. I actually enjoyed getting dressed up, so I had fun. I simply wore a reular ol' suit, no tux, and certainly didn't feel under dressed at all. So in my opinion, a tux is not a necessity. As for the pictures....Penny.....your right, not too bad....unless you purchase a lot of them...and or course, once again, my wife won out on that one!!! It got expensive!!! If I'm not mistaken, the larger ones were around $20.00 (if you bought 5 you got the sixth free) and the smaller ones were somewhere around $12.00. Have a great time!!