Tiara Day is as much about women celebrating being empowered, intelligent leaders in control of their own lives as it is about wearing tiaras. Still, you can embrace both approaches and celebrate with a physical and/or metaphorical tiara! bekyip you can go Great Gatsby
I saw Elton John at the Glasgow Apollo in 1980, (I am approaching this day from the intelligent angle ,any good ?)
I wore a pretty thing in my (tamed-for-the-day) hair when we got married. Might dig it out and wear it to celebrate (it wasn't a tiara though).