Pony festivals and celebrations for bronies and pegasis to observe in honor of our glorious Princess Celestia and Princess Luna. This is for the remainder of 2011 and for all of 2012. Of course, there are no plans to actually have real gatherings for these. So celebrate them in your own way.

December 22, 2011 - Winter Festival of the Two Sisters
This is the shortest day of the year and the longest night of the year. The Winter Solstice.

January 5, 2012 - Perihelion Celebration of Celestia
The Earth is closest to the Sun on this day.

March 20, 2012 - Spring Festival of the Two Sisters
Known informally as Winter Wrap Up. This is the vernal equinox.

May 6, 2012 - Perigee Celebration of Luna
The Moon is closest to the Earth on this day.

June 20, 2012 - Summer Sun Celebration
The longest day and shortest night of the year. The Summer Solstice

September 22, 2012 - Autumn Moon Celebration
The autumnal equinox.

December 21, 2012 - Winter Festival of the Two Sisters
The Winter Solstice for 2012