This is an important service. Literally, "pomen" means "memorial service", but the significance of the 40 days is that the Orthodox Church teaches that there are two judgements.
The first, or “Particular” Judgement, is that experienced by each individual at the time of his or her death, at which time God will decide where the soul is to spend the time until the Second Coming of Christ. This judgement is believed to occur on the fortieth day after death.
The second, General or “Final” Judgement will occur after the Second Coming.
Candles were also lit for Baba on the day by family members at this small church in Montenegro.