What happens when you put a block party on a stage? Mexican band Grupo Firme answered that question Saturday night — and the 25,000 fans in attendance at MetLife Stadium in East Rutherford knew it from the first notes. The catchy single “Ya Supérame” (“Get over me”) played a little after 8 p.m. as everyone’s wristbands (handed out at entrance gates) lit up on cue and the crowd held up their beers as the seven-lead members of the band ran up the catwalk. Things got rowdier from there. Members of the Tijuana band paused to take tequila shots. Folklórico dancers wearing colorful floral dresses pr…
