Charter Day celebrates when, in 1681, King Charles II of England gave William Penn a charter for land in the new world.
That land (spoiler alert) became Pennsylvania.
To celebrate the occasion, the State Museum in Harrisburg will display Penn’s own copy of the charter between Sunday, March 10 and Friday, March 15. (FYI: Charles II actually granted Penn’s request on March 4.)
The museum and several other historical sites across Pennsylvania will also offer free admission on Sunday to mark the occasion. You can see a list of participating sites here, or check them out on the map below.