I was waiting for the site to update but it is already November and I need to post this. http://www.wickedfaire.com/
While it is not a purely steampunk event there is plenty of steampunk, also Renn Faire, goth, BDSM and anything else you can think of. I really can not say how great this event is you really need to go. This years theme is Fairy Tales Gone Awry my fiancée and me are going as Tinkerbell and Peter Pan, with a color and chain on one of the days. It is 16+ and for good reason. If you go to one event next year this is the one you should go to.