Seeing as my friend in the regular Zero costume, having had C.C. with him, didn't get recognized a lot (even when he was wearing the mask!) the past two or three cons, you might not get any recognition outside of a Code Geass photoshoot.
Since it's currently not airing, it suffers from much fewer people paying attention to it.
Zenkaikon ~ Tanoshiicon ~ Otakon ~ Saikoucon