Everything is in one spot! The ceremony and reception are both at the Exchange Conference Center, at the end of the working Fish Pier in Boston. You can get there on foot, on the T, or by driving. The closest T stop is the World Trade Center on the Silver Line T. If you're driving, just pull into the fish pier and tell them that you're attending the wedding. You'll drive to the end of the pier and there's plenty of free parking right around the entrance to the Exchange Conference Center.
The main highways coming in are 90 and 93 which both have exits close to the venue. Noah and I aren't exactly praised for our sense of direction but if you'd like to risk it, we'll gladly send you detailed directions. Otherwise, you may want to trust your favorite search engine.