There has not always been an ice rink in Georgetown and a couple years ago, when the weather was cold enough for long enough that the canal froze over thick, the Washington Post published this article.
"Trying to plan a skate on the C&O is a little like trying to anticipate a flash mob. There is no schedule, and there are no signs," the article said.
Skating on the canal can be dangerous if the ice isn't solid enough.
"The rule of thumb to be sure the ice is solid, skaters said, is to wait for at least a week of consecutive days with below-freezing temperatures," the article said. "Some years, that never happens."