The IWRG 8th Anniversary Show was a major lucha libre event produced and scripted by the Mexican International Wrestling Revolution Group (IWRG) professional wrestling promotion on January 1, 2004. The show was held in Arena Naucalpan, Naucalpan, State of Mexico, which is IWRG's primary venue. As the name indicates the event commemorates the anniversary of IWRG, which was founded on January 1, 1996.

The main event match for the show was a best two-out-of-three-falls six-man tag team match with Consejo Mundial de Lucha Libre (CMLL) representatives Brazo de Plata and El Felino teaming up with IWRG mainstay Fantasy and El Felino as they defeated CMLL regular Scorpio Jr. and IWRG's Cerebro Negro and Mike Segura in a best two-out-of-three-falls six-man tag team match

Wrestler-turned-promoter Adolfo "Pirata" Moreno began promoting wrestling shows in his native Naucalpan de Juárez, Mexico, bringing in wrestlers from Empresa Mexicana de Lucha Libre (EMLL) to Naucalpan as well as featuring wrestlers from the Mexican independent circuit. Later on he would promote shows mainly in "Arena KO Al Gusto" and served as the Universal Wrestling Association (UWA) partner, using the name Promociones Moreno as the business name for his promotional efforts. In 1977 Moreno bought the run down Arena KO Al Gusto and had Arena Naucalpan built in its place, an arena designed specifically for wrestling shows, with a maximum capacity of 2,400 spectators for the shows. Arena Naucalpan became the permanent home for Promociones Moreno, with very few shows held elsewhere.

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