Jennifer Wood, with the horse show, said she hoped that the last of the horses and spectators would be gone before the worst arrives.
"Luckily, we don't think we're going to have much of an effect," she said.
With the full force of Sandy expected to arrive sometime on Monday, school schedules were in jeopardy.
"We're reminding people to check our website periodically just in case the weather becomes nasty," said Phil Kavits, a spokesman for Prince William County Public Schools.
Officials with D.C. Public Schools also asked parents to check the school system's website. "We are taking every step necessary to ensure that our buildings are protected throughout the storm and ready to open on time," spokeswoman Melissa Salmanowitz said in a statement.
Public schools in Prince George's County were previously scheduled to be closed Monday for a teacher workday, and if the storm holds its path, none of the region's schools is likely to be open, although most said they will wait until Sunday to decide.
"A lot of it depends on which track the storm takes and when it hits," said Dana Tofig, spokesman for Montgomery County Public Schools. "There really isn't much we can do except wait to see what happens."
Although school officials have a window that lets them delay their decision making, the rest of the officials and populace did not. Governors — including Virginia's and Maryland's — declared official states of emergency. District and state highway crews prepared to clear debris from roads. The region's utility providers called on companies outside the area to send in as much help as possible. Dominion Virginia Power asked to borrow 2,000 workers to help, while Pepco asked for 2,500 to be sent to the District and Maryland.