Courtesy of the Countdown extension, custom JavaScript, and the Fandom Staff, here are the countdowns:
Halloween[]
Only October 31 2016 00:00:00 -0700 until Halloween...
2017[]
Only January 01 2017 00:0:00 -0700 until 2017...
Gamma's 12th birthday[]
Only February 25 2017 18:34:00 -0700 until Gamma's 12...