The Expiry Date of an Expiry Date

Leeds Grant Theatre has "Name a Seat" fundraising event for its 145 anniversary. I donated 145 pounds for naming a seat which is supposed to carve donor own name. I found that this plate is not permanent, it will be removed five years later, that means the plate will be expired. So I decided to put the expiry date of this plate instead of my name on the plate. The existence of this plate is purely for memorizing its own expiry date. This work is called "The Expiry Date of an Expiry Date". You could find it on seat S8 at Leeds Grand Theatre. Of course you have to buy a ticket for seeing it so i think this work is not really a "Public Work". Since this work is still "functioning" before its expiry date, so I submit this work as a record in photography. It is an open edition work.