Empathy

Empathy is the 18th-23rd day and holiday in Bluth, for the holiday the people celebrating it needs to have empathy for as long as the day is (6 days), the holiday is also the main events of Episode 50: A Very Madden 08 Christmas.

In A Very Madden 08 Christmas
The entire episode (except for the first thirty seconds of the episode which takes place on Why is Scott Wearing That Hat? Day) takes place during the holiday and Scott Wozniak tries to have empathy throughout the 6 days of Empathy.

Trivia

 * Empathy is the only holiday and day in Bluth that doesn't end with "Day".