4th October - a special day?

I'm in Lithuania for my 8th time (crazy I know) and have finally made it to Šiauliai. As I've been walking around today (morning of 4th October), I've seen many children with small bunches of flowers. Then passing a flower shop, there's a huge queue of teenagers all waiting to be served (40+ people). It seems there's some kind of special day today, could anybody enlighten me? Or have I just stumbled upon some particularly romantic kids? Ačiū!