Valentine's Day specials:
Valentine's Day episodes
Be My Valentine, Charlie Brown
A Charlie Brown Valentine

St. Patrick's Day specials:
St. Patrick's Day episodes

Easter specials:
Easter episodes
A Claymation Easter
The Great Egg-Scapade
It's the Easter Beagle, Charlie Brown

Fourth of July specials:
Fourth of July episodes
Boston Pops Fireworks Spectacular
A Capitol Fourth
Macy's 4th of July Fireworks

Thanksgiving specials:
Thanksgiving episodes
A Charlie Brown Thanksgiving
Garfield's Thanksgiving
Macy's Thanksgiving Day Parade

New Year's specials:
New Year's episodes
Doctor Who - Resolution
Doctor Who - Eve of the Daleks
Happy New Year, Charlie Brown!
Rudolph's Shiny New Year