Tau Day was first. specifically created as a day to promote tau over pi being taught in schools. (because 2 pi is always better than one.) (sorry. sorry. Couldn't resist.)
Tau isn't real, it's a social construct. Think about it: did you ever see tau in nature? "I have eaten tau apples" said no one ever. Face it: it's made up by humans and isn't real in any meaningful way
considering that pi is the ratio of a circle's circumference to it's diameter, where tau is the ratio of a circles circumference to it's radius, anywhere you see 2pi in nature, you're seeing tau, too.
Don't mind me. I just like making bad math puns; so 2pi will always be better than 1. (especially around my family... quite vociferous about which pie is best. Apple, btw.)
if you want to know the percentage of something (e.g.: 6% of 50) you can swap the numbers around: 6% of 50 = 50% of 6 = 3
that is because it's simply a multiplication, 6% of 50 = 6/100 * 50 = 6 * 50/100 = 50% of 6
If it's a conspiracy, it's one I can get down with. My college was celebrating today by having free mini one person pies available for students and staff. They were just cheap store ones, but that helped make my lunch easier to decide on.