Flight
The wedding and all accompanying festivities will be right in Hull, MA, about a 45 minute ride from Logan Airport. The good news is, once you get to Hull, everything is either in the resort or right next door. If you don't want to rent a car, an Uber/Lyft will most likely be your best bet to get you from the airport to Hull. Or, you can take the Logan Express shuttle from the airport to Braintree, and Uber/Lyft the rest of the way if you want to save a couple of bucks. There's also a water ferry that goes from the airport right to Hull, and will get you less than 5 miles from the resort, but that schedule can vary. Info for the shuttle and the ferry are at the link.
Hotel
EDIT: RESORT IS FULLY BOOKED. The Nantasket Beach Resort, which is right in the heart of all the wedding action.
Hotel
This is the next closest option to the venue now that the Resort is fully booked.
Hotel
20 minute Uber from the action!
Hotel
Little further (25-30 minutes away) from the venue, but you'll have the pleasure of staying in luxurious Quincy, MA.
House Or Rental
Lot of off-season deals, especially if you're traveling with a group.