Well here's a peaceful bit to this chapter. Tobli is having issues selling tickets for his concert. And pretty much steps on the doormat named Yuna to get her to do the selling.
This thing is rather fickle. There's only certain people who will buy your tickets at a high price. And you only get one shot to sell them. Better use a guide for this one. Might as well do some publicity too. Your main goal is to sell all the tickets. But if you're going for the best stuff or the "Key to Success" accessory (Double's everything your stats, gil earned, EXP earned, AP earned). Then you want to make a huge profit. So yeah use a guide for this one.