Today is Mettarë on the Elvish calendar.
This is one of the special days that does not belong to any of the six Elvish seasons and it is not included in the six days of the week. Mettarë is the end of the Elvish solar year, coranar, or seasonal year, loa, that is equivalent to a year on the modern Gregorian calendar.
Not much is known about how the Elves may have celebrated the end of the year, if in fact they did at all. It was most likely a time of reflection for the Elves. If Mettarë was celebrated, it may have been part of a two-day festival that included Yestarë, the first day of the Elvish year.
Ú i vethed… (This is not the end…)*
*The above is written in the Elvish tongue of Sindarin.