Mexico's President on Wednesday asked Puerto Rican rapper and singer Bad Bunny to perform a free concert in the vast Zocalo square in Mexico City's center after a fiasco with Ticketmaster left hundreds of ticket holders unable to enter his sold-out show at the Estadio Azteca stadium on Friday.  "I know he is super busy and tired because he works a lot, but I'm asking him to consider the possibility of coming to Mexico to the Zocalo. We can't pay him. It would have to be a collaboration," President Andres Manuel Lopez Obrador said during a regular news conference.  Ticketmaster, which has blamed the issue on an "unprecedented number of fake tickets", said in a statement on Monday it is collaborating with authorities and committed to fully reimbursing fans that could not get into the concert, plus an additional 20% of the total cost of the ticket.  In neighboring United States, Ticketmaster faces a tsunami of criticism for problems in selling tickets to a 2023 Taylor Swift tour.   US Senator Amy Klobuchar has said a Senate antitrust panel will hold a hearing on the lack of competition in the ticketing industry following the company's Swift ticket sales debacle.