It's not so much a festivity, but I think if All Souls day is included, then January 12-13 is also important for Lithuanians and we commemorate the day by lighting bonfires in Vilnius or candles by windowsills
It's still too early, most likely it will be ticketed (the last event was with tickets). It would be good to check their website in spring: dainusvente.lt
My biological mother is Lithuanian but I never knew her. She lives in Lithuania but I live in England. I pretty much know nothing about Lithuania and it makes my heart hurt. I wish I could find her. I know that she is or was a nurse but not much else.