So far, most of my holiday-themed stories are in the Caffrey Conversation series. 

Christmas or New Year's

Choirboy Caffrey - set in early December, features a Christmas concert

In the Driver's Seat - features Christmas past and present

By the Book - features a New Year's party

Caffrey Aloha - features Christmas and New Year's celebrations, plus a wedding

Wish on a Star - set in January, features Christmas memories  

A Caffrey Christmas Carol - inspired by A Christmas Carol by Charles Dickens 

Holiday Letters - receiving holiday letters inspires Neal to write his own letters  

Movie Night - features Christmas celebrations and watching holiday movies

Joyeux Noel, Joyeux Neal - a chapter in my Fanfic Short Stories. Neal is depressed, but he seeks help and has a Joyeux Noel

St. Patrick's Day & April Fools

Spring Break - also features a birthday 

Mother's Day

Homecoming 

Father's Day & Independence Day

Caffrey Disclosure - The opening chapters include Father's Day, and Independence Day is featured in the "Fireworks" chapters.  

Birthdays

Sandcastle - Frozen story about Anna and Elsa celebrating a birthday as children

Caffrey Conversation stories featuring birthdays for Peter Burke:

- Treasure Hunt

- Wish on a Star  

- On Ice 

Caffrey Conversation stories featuring birthdays for Neal Caffrey:

- Caffrey Flashback - Neal's first big family birthday party

- Spring Break 

- Splash

Caffrey Conversation stories featuring birthdays for other characters:

- Caffrey Disclosure - Angela's birthday falls near the middle of this story. At the end, Henry's birthday is combined with a family reunion 

- Caffrey Aloha - Noelle's birthday falls on Christmas, and the family celebrates in Hawaii

- Full Circle - Henry gets married on his thirtieth birthday - not yet posted