Ilyap'a is one of my favourite weather-related gods, along with Quetzalcoatl's twin brother Xolotl, the jackal-ish Egyptian god of storms, Set, and everyone's favourite thunder god, Thor.
I've never been as interested in Incan deities as perhaps I should be, considering I love whole groups of other Central and South American deities, but Ilyap'a is an exception . He was said to keep the Milky Way in a jug and used it to create rain.
If that's not a good enough excuse to celebrate his feast day, I don't know what is!
So, without further ado: