hard to say what "informal" is. although i generally hate getting dressed up, i think it's better to be overdressed. i just plan on wearing a dress shirt, slacks, shoes. maybe a sweater if i can find one. i would go for your wallet when the check comes, as a courtesy, however i've heard usually the programs pay.
is anyone else going to be forced to missed some of these? i hope im not screwing myself by not going. my schedule, and money is tight, and if i were to go to all of these i would have to make a couple flights to the same city/area etc, which is really difficult for me....