Don't forget to use your moogle tomes!

[Dustytome]

The event is over, no more turning in Tomestones of Pageantry

Event page: Here.

The event page states the following:

Irregular tomestones of pageantry, and item exchanges will only be available during the event period.

Unlike previous iterations, this round appears to not allow the purchase of items after the event has concluded.

edit: Also from FFXIV's official English twitter account:

DON'T FORGET
You must exchange your irregular tomestones before the event ends!

Please spread the word if you see this in time. A lot of people are not only under the impression they can spend the Tomestones of Pageantry after this event ends, they're actively telling people that based off of how previous events have worked.