Flights
Washington Dulles (Closest Airport)
Baltimore Airport (May be cheaper)
Washington Reagan (in case you want a third option)
Things to Do In the Area
Hollywood Casino & Racetrack - Charles Town
Short trip for those who may be interested in satiating multiple vices simultaneously...
Harpers Ferry Attractions
In case the history of multiple different types of spirits is not enough for the more curious of intellects
Booze
Wine Tours
Notwithstanding that the wedding is at a vineyard, there are 1,000 of them in the area for those who may want to do some touring.
Local Breweries
Since Breaux doesn't have brews, if that is more your speed... Harpers Ferry Brewing is a solid choice.