Which of these sentences is punctuated correctly? 1) although the concert doesn't start for over an hour; most of the fans have already arrived at the concert hall. 2) the concert doesn't start for over an hour; though, most of the fans have already arrived at the concert hall. 3) most of the fans have already arrived at the concert hall; however, the concert doesn't start for over an hour. 4) even though the concert doesn't start for over an hour; however, most of the fans have already arrived at the concert hall.