Since the calendar is already so crowded, we suggest sharing with one of these existing holidays.

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12 February      [Darwin Day]
  1 April              [April Fools Day]
30 April             [Honesty Day, (ironic)]
  7 May               [National Masturbation Day]
17 May               [International Day Against Homophobia, Transphobia and Biphobia]
25 June              [World Vitiligo Day]
30 October        [Mischief Night]
14 December     [Monkey Day]
23 December     [Festivus]