A story or poem or something else for every year since 1400.
It has to be in honour of the year, but it doesn't need to be set then.
So: Fort Assumption was built in 1753, so that explains that. Sunflowers were introduced to Europe in 1510, so that explains that. And so on.
The project works chronologically.
Pick a year within ~30 years of where the project has so far reached.
Check under "Forthcoming" that the year isn't already reserved.
Create a story/poem/something else dedicated to that year.
Send an email.