The Monsters of Rock Tour 1988 was a festival tour of the USA in 1988, headlined by hard rock band Van Halen as part of their promotion for their OU812 album with heavy metal band Metallica as well as other bands including Scorpions, Dokken, and Kingdom Come. It formed the first section of the OU812 Tour, the main part of which followed immediately after Monsters of Rock 1988. As one of the many well known Monsters of Rock tours, the tour featured an impressive line-up, especially for a single day event, and proved very popular.
Being a large scale event with multiple acts, there was a long gap between many dates when the bands' gear was transported and set up.
In Miami, a stadium-wide food fight took place. The show was general admission and the food fight took place between the concertgoers in the stadium stands and those on the field.
In Los Angeles, the power was shut off during Metallica's set because fans were aggressively rushing the stage. The members of Metallica sat on the drum riser and watched. After a short break, Metallica resumed their set. Fifteen people were arrested. 
Given the extreme nature of Metallica's 1988 release, the bands following act Dokken would come over severe ridicule from the thrash metalheads in the crowd for not matching Metallica's intensity. 
In Dallas, Van Halen's set was cut short by vocalist Sammy Hagar's voice problems. He promised that Van Halen would return to Dallas and play a free show. Van Halen made good on the promise three years later on December 4, 1991 when they played a free concert at Dallas Alley, a gentrified area on the northwest side of downtown Dallas where free concerts were often hosted to boost traffic for restaurants and stores in the adjacent collection of shops. The opening act for the Dallas show in the Cotton Bowl was Stevie Ray Vaughan.