Certain holidays in Lithuania are dedicated to specific groups of people. Mother's day on the first Sunday of May typically includes children giving presents to their mothers. Fathers are similarly honored in the Father's day one month later (first Sunday of June), but the traditions for celebrating this holiday are not as strong.
Day of science and knowledge (September 1st) is the universal start of schoolyear in Lithuania, also followed by most universities. Kids bring flowers to their teachers and there are no lessons but a short introduction. Alcohol sales are banned all over Lithuania that day to discourage teenagers from getting drunk in post-holiday meetings with classmates.
Labour day (May 1st) used to be a major affair marked by massive state-organized parades during the Soviet occupation, participation in which had been mandatory for many people. After independence, it was briefly not a public holiday at all. Reinstated as such by the Socialdemocrats it failed to generate public attention and you will not see labor rallies of the southern European scale in Lithuania. Many people regard the Labour day to be primarily a Soviet holiday.
Women day (March 8th) celebration traditions also date to the Soviet Union, but this holiday is more popular than the Labour day. During it, males typically congratulate their female co-workers and bring them flowers.
Soviet Victory day (May 9th) is still regarded as their own "national day" by many local Russians who celebrate it at Soviet soldier memorials. It is undoubtedly the most controversial one among the once-mandatory Soviet holidays. To Lithuanians, the Soviet victory (and Western non-intervention) was a tragedy as it meant 45 years of occupation as well as a guerilla war and Genocide.
In the 1990s the Saint Valentine day (February 14th), a holiday for lovers, gained a popularity that sometimes exceeded that of the independence day two days later (February 16th). Not native to Lithuania the Valentine day celebrations were completely imported from the West.