We booked blocks of rooms at the Comfort Inn and Days Inn in Dover, NH near the reception. There are also lots of other hotels and inns in Dover and nearby Portsmouth.
Almost definitely. Dover itself is walkable and compact, but you'll need a car just to get to Dover from the airports in Manchester and Boston and to get from the church in Rollinsford to the reception in Dover.
There is a parking lot at the church. There is a free valet at the reception, but we want you to be unfettered for our open bar! If you're staying at any of the nearby hotels, consider dropping your car off after the ceremony and using Lyft, Uber or the hotel shuttle to get to the reception.