Rabbi Rachel Nussbaum's Yom Kippur Sermon, entitled "The Delta of Change... and Possibility (Gam Zeh Yaavor)" is available to listen to or read.
During these Covid times, in my household, we've embraced every possible excuse for a celebration... including attempting to mark not only birthdays but also half-birthdays! Elisha's half-birthday is up next; right now he's closer to his 8th birthday, but in a few weeks, he'll pass the halfway point and tip closer to his 9th. Segmented in this way, the two halves of each year take on different characters, much like the two halves of a football game, with the halfway mark acting as a fulcrum, tipping us from "beginning" to "ending."
When I was 10 years old, my great-grandfather died early on Erev Pesach. He was buried just hours later (a hurried funeral, to get it in before chag began), and then my family sat down to our first night seder a few hours after that. That year and ever since, the co-mingling of bitterness and sweetness, sadness and joy has been an important feature of every Passover seder for me.