National Of The United States Puns

To be honest, I'm not shedding any tears over it.

Days That Are Puns

1/23 - January 23rd reads like 123
3/10 - Mar10 Day - Nintendo's Mario Day
3/11 - There's an awesome band called 311
3/14 - 3.14 is the first few digits of Pi AKA Pi Day
5/4 - May the 4th be with you - A pun on "May the force be with you." AKA Star Wars Day
7/11 - Free Slurpee Day at 7 Eleven stores
9/11 - No intention of being offensive with this one. 9/11 reads like the emergency phone number used in the United States
10/4 - Pun for 10-4, which is similar to saying "roger that"
10/23 - National Mole Day (Avogrado's number) 6.02 x 10^23

Please mention any I missed!