Hi, Ahava,
We have a very special holiday in my country, Bulgaria (it's a small country in Southeast Europe, on the Balkan Peninsula), and it is actually today, on March 1. As far as I know, it is not celebrated in other countries. We call it Baba (= granny) Marta (from mart - the Bulgarian word for the month of March).
Baba Marta has a pagan origin, as is often the case with holidays. What is very specific about this day is that we all wear martenitsas. A martenitsa is made of two interwoven threads: one white and one red. The red symbolises friendship, love and health, the white stands for purity and sincerity. You wear a martenitsa until you see your first spring bird (a migrating birds, such as a stork or a swallow). Then you tie it on a fruit-bearing tree for fertility. The martenitsa tradition is believed to have been introduced by the Thracians who lived here many many years ago.
There is also a fortune-telling custom connected with Baba Marta. On March 1 people choose one day from March 1 to 22. If the day turns out sunny, the year will be successful for them. If the weather is bad, the year will be difficult.
I hope you'll find this information interesting and helpful. Happy Baba Marta!