I noticed the last few breads anons talking about April 18 as being significant. However, if you look at the time between the two cleanings of Q's GA board 2/18 and 3/18 being exactly 4 weeks, then another four weeks later is 4/15:
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the death of Abraham Lincoln (1865)
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the sinking of the Titanic (1912)
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the EC-121 shootdown incident: North Korea shoots down a United States Navy aircraft over the Sea of Japan, killing all 31 on board (1969)
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the Boston Marathon bombing (2013)
Also the birthday of NK's first Supreme Leader, Kim II-sung (1912) (same day as Titanic sinking).
Also (usually) Tax Day in USA (but not 2018) because it's a Sunday and it's Emacipation Day on the 16th.