I think people celebrate because of holidays or something special.Christmas is a holiday everyone needs to celebrate.Thanksgiving is another holiday everyone needs to celebrate.My family celebrates Christmas,Thanksgiving,Valentines Day,Easter,April Fools,and 4th of July.I also think people celebrate because a sibling/family member graduates or goes to college.Or when someone wins something like the lottery,The X Factor,or American Idol.People celebrate because of holidays or something special that a family member did or does.