There's nothing about this that says 'holiday' unless, of course, you grew up on an antebellum plantation and had peacocks strutting around year round. According to Wikipedia, peacocks will eat rodents and snakes, so that's probably why people had them around.
Or maybe it's because they look so beautiful - that's why I plan on having a pet peacock on my imaginary farm someday, along with about 40 head of Mr. Cow, a miniature cow (hamster sized) that I hope science can make by the time I'm 70 and have time to tend my miniature livestock herd.
Another fun fact about peacocks: they will warn of tigers in the forest by calling. Do you know what a peacock's call sounds like? I don't. I'd heard a high trilling noise and cock my ear and say, "What was that ARGH!!! WHAT HAS MY NECK?!"