2 sentences

1. 今天是我祖父的忌日。

   jīn​tiān shì wǒ zǔ​fù de jì​rì.

   Today is the anniversary of my grandfather's death.

   Source: Dong Chinese Dictionary

2. 古人认为在忌日出行是不吉利的。

   gǔ​rén rèn​wéi zài jì​rì chū​xíng shì bù jí​lì de.

   The ancients believed it was unlucky to travel on the anniversary of a relative's death.

   Source: Dong Chinese Dictionary