I totally forgot that I also have worn mine on Founder's Day and on my chapter's founding date (two days before our national date, lol).
I think badge attire day is Mondays where I work so maybe I'll start wearing it on Mondays as well. I had always worried about trying to look like a student or "re-live glory days" but I think maybe I'll try to stop worrying about if people perceive me as doing that and just rep Zeta
The chapter that I advise has their meetings on Sundays so that wouldn't work for me.