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International Talk Like a Pirate Day is a parodic holiday created in 1995 by John Baur and Mark Summers of Albany, Oregon,[1] who proclaimed September 19 each year as the day when everyone in the world should talk like a pirate (that is, in English with a stereotypical West Country accent).[2] It has since been adopted by the Pastafarianism movement.[3]

- wikipedia has everything!

Instead of answering your phone with "Hello", you'd say, "Avast!"

If I were being more serious, I'd pick the birthday of a famous scientist - maybe Darwin Day on Feb 12