Lithedays

Lithedaysrefers to the three (sometimes four) feast days between the months of Forelithe and Afterlithe of the Shire Calendar; in purpose and function the Lithedays were equivalent to the enderi of the Reckoning of Rivendell.

They were mostly referred to as Midsummer's Eve.

History
Approximately in TA 2842, invisible ink was written on the map of the Lonely Mountain, as there were predictions that the last light of Durin's Day will shine upon the keyhole, when the thrush knocks. One hundred years later, they appeared when Elrond, Lord of Rivendell studies the map (which had been under Thorin's ownership at the time).

During the Third Age, Bilbo Baggins remembered that his grandfather, the Old Took, had parties where Gandalf would perform Fireworks.