Organizer Don Stockwell said the concert starts at 7 p.m. and doors open at 4 p.m. Ozzy Osbourne will take the stage at 8 p.m. The concert ends at 10:30 p.m.
Stockwell said there would be “many surprises” during the show.
Stockwell said that Black Sabbath arrived with 50 guitars.
Stockwell also wished to remind concertgoers that marijuana is illegal in Costa Rica, and asked that concertgoers not take marijuana to the concert.
Some 20,000 people have already purchased tickets, which are still available.