Harrisburg International Airport is very nearby the venue and hotels, and would likely be most convenient.

However, sometimes the costs of flying into smaller airports are far higher. If that's the case, the Philadelphia Airport is about a three-hour train ride away from Harrisburg. You could get an Amtrak ticket from Philadelphia (30th Street Station) to Harrisburg. To get to 30th Street Station from the airport, you can get the "Airport Line" Septa train towards Center City and get off at the 30th Street Station stop.

Additionally, you could also rent a car from the Philadelphia Airport. The drive is about two and a half hours long, and there is free parking at the hotels.