Corrected entry: After Lollapalooza David bought the tickets on eBay in order to travel in time and attend to the concert, but there were double tickets, so if they use their tickets the other people with the same tickets could not.
ozwal13
23rd Feb 2016
Correction: Not a mistake at all. This just means they had to hope to get in line ahead of the original ticket holders.
Phixius ★