Nice story and photos, @trincowski! I have not been to Tytuvėnai yet :)
It is really true that the night of Saint John does not have as much Christian traditions as it used to. Morever, it still has pagan traditions from Balts, the ancestors of the Lithuanians, such as searching for the magic fern blossom at midnight, jumping over bonfires, greeting the rising midsummer sun and washing the face with a morning dew, young girls floating flower wreaths on the water of river or lake. Besides, this festival is very popular because the name Jonas (in English, John) is very popular in Lithuania, the same as Janis in Latvia and Latvians are known to celebrate this festival even more than Lithuanians do :)