since many of us more annoying parents who know better about the Bloomberg/DOE.. since we already know the deal, and KNOW that no investment has been made to have truly meaningful conferences (lasting more than a fraction of the time any other city in the civilized world would allow) by paying the schools and teachers for enough time.... since all this is true, we recommend that you simply go to say hello, ask if there is anything in particular the teacher may want you to know/help with, and then leave a snack for the teacher not to pass out during their marathon of similarly too-short segments with far too many parents.
Seriously, DONT expect to be able to have any serious discussion; hopefully, you have an email or a knowledge of how to actually have a conversation with your student's teacher(s)... the city this year sent out emails saying how very important it was for parents to be 'part of the school learning community', and stressed how much they valued attendance at these 'soundbites' that they called 'conferences'...but the DOE makes absolutely NO substantive efforts to make these conferences meaningful...
I say go if you can, expect to just say hello, maybe grab a single interesting tidbit if you can, and find another way to get real information at another time/place/medium...