Today is

Carpe Diem Day
 For Pete's Sake Day

Carnival Day
 Letter to An Elder Day

Thermos Bottle Day
 Levi Strauss Day

Natioanl Pistachio Day
 National Customized Wheel and Tire Day

National Set A good example Day
 National Personal Chef's Day

Tell A Fairy Tale Day

and
 World Pistachio Day