The congress will be held at the Intendencia de Montevideo that is located in downtown. There are many options of accommodations near the congress venue. We suggest some options to consider depending on your budget:

Hotel America (40 USD, single room) - http://www.hotelamerica.com.uy/inicio/es
Crystal Tower Hotel (50 USD, single room) - https://crystaltowerhotel.com.uy/rooms-list.html
Ibis Montevideo Rambla (52 USD, single room) - https://all.accor.com/hotel/3539/index.es.shtml?utm_campaign=seo+maps&utm_medium=seo+maps&utm_source=google+Maps

Students hostel (dormitory rooms from 19 USD) - http://www.studentshostel.com.uy/

Airbnb (apartments and rooms) - https://es-l.airbnb.com/montevideo-uruguay/stays

Booking (hotel reservations in Montevideo) - https://www.booking.com/city/uy/montevideo.es.html