Each year on March 1, the spring celebration Mărțișor is celebrated in Romania.
It is also referred to as March Amulet Day.

March Amulet (Mărțișor) Day
Issued by Romanian post office in 2024
Designed by George Ursachi

The Romfilatelia offered up this wonderful explanation of the day last year:

As a symbol of spring, the March Amulet (Mărţișor) appears as a sign of the return to life of nature with its entire universe. It is offered every year on March 1^st, as a talisman of appreciation, luck and prosperity. Men give it to ladies and young ladies as a sign of admiration and respect.

A legend explains the association of two colours – pure white and red – in the braiding of the strings of the March amulets, starting from an incident in which a snowdrop, which had risen early, was surprised by bad weather, with frost and snow. The Spring Fairy, loving and caring, removed the snow and warmed it in her hands but she injured a finger and a few drops of blood fell on the snowdrop and the nearby snow. Miraculously, the snowdrop recovered, and winter declared itself defeated.

As a visible presence, the March amulet is a small adornment tied with a string braided from a white and a red thread, which appears in the tradition of Romanians and some neighbouring countries (see Republic of Moldova, Bulgaria). Early spring flowers are offered together with the March Amulet, among them the most representative being the snowdrop.
MARCH AMULET (MĂRŢIȘOR) DAY – Romfilatelia – O lume intr-un timbru
With great thanks to the people at Romfilatelia for supplying this translation as well.