http://math.uchicago.edu/~wald/con18a.pdf
http://math.uchicago.edu/~wald/con18b.pdf
http://math.uchicago.edu/~wald/con18c.pdf
http://math.uchicago.edu/~wald/con18d.pdf
(The cryptics I brought to the 2018 National Puzzlers' League convention; these are a three-puzzle suite and a separate puzzle for a 5K race that was held there.)