We have a wedding block at the Fairfield Inn. There's also a Hilton very close to Threes, and many other hotels/AirBNBs in the Brooklyn area.
Hotel
Fairfield Inn & Suites by Marriott New York Brooklyn
181 3rd Avenue Gowanus, NY 11217 (718) 522-4000
You can use the below room block link until August 31, 2021.
https://www.marriott.com/event-reservations/reservation-link.mi?id=1625836994301&key=GRP&app=resvlink