Happy Tau Day 10 years ago
While I appreciate the actual methematical point of the site (and assume there is a small sense of deadpan humor intended), discussions as to which day should be "celebrated" are pointless since the day's importance to the general public has nothing to do with the value of pi or tau, but instead the fact that pi is a homonym of pie and march 14th happens to be the same numerically as the first few digits.
As far as I know, that's the extent of the popularity - you can make pies on Pi Day. Again, I'm assuming the Tau day thing is a bit of deadpan, but otherwise it seems to me to be that simple.