The Ministry has reported that those who are not married in compliance with the law yet will be receiving an owl stating whom has been selected as their best mate, and will be required to solemnize and consummate their marriages by the Summer Solstice. Students at Hogwarts, however, will receive their letters in person by Delores Umbridge. This deadline is to ensure a maximum birthrate before the following May, in time for the second anniversary of the final defeat of You-Know-Who.