Hotel
This 10-room boutique-style inn would be less expensive than Wequassett but with a 3-night minimum stay. Please ask for Phoebe when calling to reserve your room and tell her that you're booking with the L'Hussier/Thomas wedding. They may be able to offer a boat ride to the wedding or arrange for other forms of transportation for you!
House Or Rental
There are a lot of great Air BnB options in the towns surrounding Wequasset (Harwich, Orleans, Chatham etc.). This would likely be the most reasonable option, especially if you are planning to travel with a group of guests.
House Or Rental
Some of the best, local options for home rentals can be found through this Cape Cod-based rental website. Many of these properties are not listed on the nationally recognized websites, resulting in nicer homes for less money. You may be able to get an entire week at one of these homes for less than the cost of 2 nights at the major hotels.
Hotel
This will be the most expensive option, but they have reduced the minimum stay from 3 nights to 2 nights for guests attending the wedding. When calling, say that you are with the L'Hussier/Thomas wedding for a 10% discount. *We do not expect our guests to stay on site*