In my ancestory, no one celebrates Diwali. The reason for this is given that a long time ago a female member died on the day of Diwali. In the Garud Purana, there is description about period of Sutak for different castes, and also it is written that festivals/occassions should be avoided till one year after death of a male member and till one month in case of female member. I didn't believed this rule of never celebrating a festival again if someone dies on that day. It's easy to prove something written in texts, but we can't disprove something that's not mentioned. I found that something related to this is written in the Atri Smriti:
There is no sin, if any intervening impurity, consequent on a birth or death, takes place, in the celebration of a marriage, festivity, or a sacrifice, determined upon before. So Atri has said.
This partly disproves the notion I described above but not completely. Are there any other statements like these in other smritis also?