Rómulo Méndez refereed in what 24 team format soccer tournament?
Rómulo Méndez:  He was the first Guatemalan referee ever to participate in a World Cup finals, refereeing one match in the 1982 World Cup and one match in the 1986 edition. 1986 FIFA World Cup: The 1986 FIFA World Cup, the 13th FIFA World Cup, was held in Mexico from 31 May to 29 June 1986. 1986 FIFA World Cup:  The tournament was the second to feature a 24-team format.
1986 FIFA World Cup