Possible Clues:

• While speaking glanced through mail, very important
• Sounds as if you've read the post of this important day
• Scarlet missive to signal memorable day
• Permissive chap's got angry, apparently, on such important occasions
• What recipient of message did that's said to be important
• *Memorable, as a day
• Special sort of day suggesting Hawthorne's work
• Like the final reminder of a memorable day?
• Day of a left-wing landlord?
• Having special significance