We found some hotels that are offering group rates....
Hyatt House https://www.hyatt.com/en-US/group-booking/DENXL/G-AHSB
Fairfield Inn & Suites - Denver West/Federal Center (last day to book July 21st): https://www.marriott.com/event-reservations/reservation-link.mi?id=1745347769873&key=GRP&guestreslink2=true&app=resvlink