Thanksgiving- gluttony (you eat excessively)
Valentines day- lust (people focus on more sex)
Christmas- greed (focusing on lots of presents)
Easter- envy (Christ was killed out of envy from the romans)
Labor day- sloth (everybody gets off work)
Halloween- wrath (it's about scary things, meant to put fear in people)
Your birthday- pride ( it's a day about yourself, your existence, it's pretty prideful to worship yourself if you ask me)
This is a theory but a huge coincidence if you believe in those.