This is the Burst and Headlight from Kompy's huge pic, which can be seen here. My kids appear on the middle left.

Burst and Headlight went to the event together. Not intentionally, though. Karma bought tickets so he, Headlight, Himatsu, and his twin sisters could go together. Unfortunately, Headlight got separated in the crowd and ran into Burst by chance.
And even though they managed to get one of the best seats in the house, and managed to scramble out of the worst of the crowd, these two just aren't having as good a time as they could. Burst isn't quite sure what to do, what to say, how to act...and poor Headlight just wishes one of her Big Brothers was there...

Headlight's outfit is based on this outfit  KDRaccoon put together in Rock Band 2.