IMHO non-of them were useful....and I agree with Brian, the Asian conference must be 45 minutes to an hour of them telling you "Japanese people will think your are Japanese, and may be a little hard on you if you don't under stand them" or "You have more stealth and evasion than your black friend, in Japan".
Basically, if you had anything to do with Japan Club, taken any of Masuyama Sensei's culture classes, or have been to Japan before, you don't NEED to go to any of optional workshops. I think some of the workshops may cause you to have some kind of expectation about your job or placement, when that is the worst thing you could do. If you go to your place expecting shit, then you will probably be one of those JETs who complains about everything.
Sorry for the off topic rant...
Basically, if you had anything to do with Japan Club, taken any of Masuyama Sensei's culture classes, or have been to Japan before, you don't NEED to go to any of optional workshops. I think some of the workshops may cause you to have some kind of expectation about your job or placement, when that is the worst thing you could do. If you go to your place expecting shit, then you will probably be one of those JETs who complains about everything.
Sorry for the off topic rant...