Question: How large is the hotel/casino/RV park located south of the Las Vegas Festival Grounds?
Sentence (from "Rock in Rio USA"): A spin-off of Rio de Janeiro's "Rock in Rio" festival, it was first held on May 8 and 9, 2015 at the Las Vegas Festival Grounds—a purpose-built venue on the Las Vegas Strip developed in cooperation with the festival's organizers.
Relevant evidence: No