Plan your skeptic/secular/science-related events around these calendar dates. All events occur annually on or about the same date each year:
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February 12, 2018
International Darwin Day
http://darwinday.org/
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March 14, 2018 
Pi Day
www.piday.org
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March 11-17, 2018
Sunshine Week
http://sunshineweek.rcfp.org/
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March 16, 2018 
National Freedom of Information Day
www.ala.org
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April TBA, 2018 
March for Science
www.marchforscience.com
Sunday, April 22, 2018 
Earth Day
www.earthday.org
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May 3, 2018
National Day of Reason (first Thursday in May)
nationaldayofreason.org
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June 21, 2018 
World Humanist Day
iheu.org/humanism/world-humanist-day
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September 24-30, 2017 
(2018 Dates Last Week in September)
Banned Books Week
www.bannedbooksweek.org/
November 10, 2017/November 10, 2018
World Science Day for Peace and Development
www.unesco.org/new/en/unesco/events/prizes-and-celebrations/celebrations/international-days/world-science-day-for-peace-and-development/
