Goals for the Summer (minimal priority): write Harry Potter and Stream Fusion, in which Harry learns that magical techniques which involve the creation of large structures and then the collapsing of such structures to simpler structures can often be more efficiently expressed hylomorphically, eliminating the creation of the intermediate structure.
From the pamphlet attached to the US Census: "March 15, 2010 […] Please complete and mail back the enclosed census form today."
From the actual census form: "The Census must count every person living in the United States on April 1, 2010." (and other stuff later making it clear that the date is very specific)