Pop superstar Jennifer Lopez, hundreds of dancers, drummers and gymnasts, and a paraplegic who will kick a football in a robotic suit will deliver a pre-match extravaganza Thursday to open the World Cup. After the delays that have hampered Brazil’s preparations, organizers had one overriding message for fans ahead of the 3:15 pm (1815 GMT) opening ceremony: Don’t arrive late. She will perform the official World Cup song, “We Are One,” along with Lopez, rapper Pitbull and Brazilian drumming collective Olodum in the ceremony’s grand finale. There were last-minute doubts over whether Lopez, who media reports say recently broke up with backup dancer and boyfriend Casper Smart, would attend.