There is no number in front of this lesson - it is not given as the first (though it could be) lesson when we return to the Renaissance.  No, this lesson is conducted when the first beautiful and delicate flowers of the spring, the snowdrops are starting to bloom.  That means you must have a place near you school where you can take your students to see them.  I was lucky enough to have such a spot - though it did change three times over the 30 years that I taught this lesson.  You take the students outside to see these harbingers of spring - you read "To the Virgins, to Make Much of Time" while out there - and you mention that these flowers they are seeing won't be there in a week - and that should get them thinking.  You return to your classroom, show a video (that you - or I if you want to use the one I made) on what Carpe Diem is - and you read Marvell's "To His Coy Mistress".  You end it with a story or two about what "Carpe Diem" is to you - in a very personal way.  The students - you hope (and so many have told me over the years) - leave your classroom transformed (at least for a little bit, and perhaps longer).