Called Pchum Benh. A Cambodian festival that lasts for 15 days, although the people only celebrate for 3 of them.
Pchum Ben (Khmer: បុណ្យភ្ជុំបិណ្ឌ; “Ancestors’ Day”) is a 15-day Cambodian religious festival, culminating in celebrations on the 15th day of the tenth month in the Khmer calendar, at the end of the Buddhist lent, Vassa.Pchum Ben – Wikipedia
It is said that is the most auspicious festival in Cambodia as families come together to celebrate their ancestors.
Going back up to 7 generations they pray and bless their family heritage.
Now Cambodian’s being predominately Buddhists, about 95% of the population follows Buddhism believes strongly in the next life.
They see people in this life with big cars, nice houses and large amounts of money and believe they must have done something good in their previous life. This I guess gives them a reason for accepting bad things in the here and now and trying to do good.