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Nogizaka was at GirlsAward 2013 Autumn/Winter! In fact the fashion walk part was live streamed. The above videos are captured from said live stream. Unfortunately the performance part was not streamed; the three songs performed were Seifuku no Mannequin, Oide Shampoo, & Girl's Rule, in this order.
In addition to the videos, there are also a great deal of pictures of the fashion walks, from entertainment newslets such as Tokyo Pop Line, modelpress, crank-in.net, & Natalie! For convenience's sake, all the images have been uploaded to the Nogizaka no Uta minus account! Here's the gallery for the fashion pictures, & here's the performance gallery.
Below are one image for each of the girls who did the fashion walk.