I'm sorry, but there is no specific information available about a T-shirt sponsor for the participants during the second Non-Prophet Week in the search results. If this information is crucial, you might consider contacting the organizers or associations involved with Non-Prophet Week directly for more details. You can check their official website or social media pages for the most accurate information.
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How has Non-Prophet Week been covered in various blogs and podcasts?
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What is the purpose of the Non-Prophet Week initiative?