japan
Japan Sure?
The concept of "tooth hardening day," "anti-gravity day," and "full moon gruel festival" are not commonly found in any specific country's calendar. They seem to be fictional or invented events. Different countries may have unique festivals and observances, but these particular examples have no widespread cultural significance.
The calendars of Japan include tooth-hardening day and anti-gravity day. On tooth-hardening day, a selection of solid foods thought to strengthen the teeth would be prepared, and hopes were that by nibbling on these foods, overall health would be improved. June 16 is declared anti-gravity day, and the small town of Hokkaido is known as anti-gravity town.
Gravity - 2011 I was released on: USA: 22 January 2011 (Slamdance Film Festival) USA: 23 September 2011 (Woodstock Film Festival)
Layers represent different periods of time. They are caused by factors such as wind, water, and gravity hardening them into distinct layer.
Victims of Gravity - 2011 was released on: USA: 22 January 2011 (Columbia at the Sundance Film Festival) UK: March 2011 (Bradford International Film Festival) China: November 2011 (Beijing International Film Festival)
Gravity - 2003 II was released on: USA: 28 October 2003 (Williamstown Film Festival)
Gravity - 2003 I was released on: USA: 2 April 2003 (One in Ten Film Festival) (premiere)
Bad Gravity - 2006 was released on: USA: 7 October 2006 (New England Film Festival)
France
A Lack of Gravity - 2010 was released on: USA: 24 June 2010 (Palm Springs International Short Film Festival)