I don't now about the T-shirt thing, but I can see a professor offering assignments to attend a rally. What is probably been twisted is that ANY rally qualified. A professor could make the assignment to attend, observe, and write a paper taking the what was taught in class and applying it to the rally. 
But this is a similar charge that protesters at the Trump rallies were paid. Total B.S. http://www.snopes.com/craigslist-ad-trump-rally/

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