^True! If my friend that cosplays Yukiko comes(she doesn't know if she can) she will have a roll of caution tape with her. If I remember to talk to my friend about it, I will most likely have a Koromaru plushie with me when I'm Minako. ^_^
I can't really help in terms of location since this will by first time to Otakon.
And I noticed you put Marie in green? Since she's from P4(the Golden but still...) shouldn't it be in red?