2002 - Reliant Stadium opens
History of the Houston Texans - Wikipedia
General overall view of Reliant Stadium (NRG Stadium) with the retractable roof open during an NFL football game between the Tennessee Titans and the Houston Texans, Sunday, Dec. 21, 2003, in Houston.
NRG Stadium, American Football Wiki
NRG stadium opens roof for first time in 6 years for Texans game - ABC13 Houston
NRG Stadium, Houston Texans football stadium - Stadiums of Pro Football
KPRC 2 Investigates: NRG's roof that rarely opens
WATCH: Texans open NRG Stadium roof for Week 11 vs. Patriots
NRG Stadium in Houston needs upgrades for Super Bowl LI - Sports Illustrated