Programmer's day - 256th day of the year celebrated mostly by
computer programmers (reason: 256 = 2 to the power of 8 = the number of values representable in a
byte of data).
Traditions of drinking, behaving silly, coding silly programs, mini computer games, playing with old computers, etc...
Usually on
September 13th, on
leap years,
September 12th.
see also: Pi Day