Any time the Labor Day weekend weather is nice - often there are a lot of boats out.
For many - it's the last big hurray of the season. People will start putting boats away - not realizing how much they will miss.
If you do go into the Baltimore Harbor - be sure to pay close attention to the 6 mph zone. It starts way before the harbor and the police boats often give tickets - not warnings
.
Be cool if next year - Baltimore got a few floating docks and set up bleachers for folks to come by water and watch the races.