@KimHolder's thorough answer to the question What are the consequences for a person who violates a launch exclusion zone? mentioned a fishing tournament. @PearsonArtPhoto's comment about scheduling launches during fishing tournaments got me thinking about yesterday's launch that was cancelled due to some "boats in the area".
NASA had hoped to launch the rocket early Saturday, but had to scrub the attempt because of boats in the area where the payload is expected to fall back to Earth.
It turns out there was a fishing tournament in Virginia on Saturday, three in fact! One was in Newport News VA, offshore.
(The other two were state-wide/fresh water so they don't count.)