There are two airports within about an hour of Portsmouth. You can fly into Boston Logan International Airport (BOS) and hop on the C&J bus line which will take you directly from Boston Logan Airport to Portsmouth or Dover. Alternatively, you can rent a car. Alternatively, you can fly into Portland, Maine - Portland International Jetport (PWM). If you rent a car there, the drive to Portsmouth will take about 50 minutes.
We have a block of rooms at the Homewood Suites in Dover. You can book directly through the link or by calling the hotel directly. The C&J Bus stop is right across the street. A shuttle will be available to and from the venue from this hotel! Timings TBD
We're looking at Portsmouth options as well.