Going to gigs is not just about the music. At concerts they sell t-shirts, vinyl (making a comeback), all sorta of food and film related things, except for other concerts that people would be interested in checking out!!
Why not let those fans know what else is going on at the venue? Write up the 2-3 bands on the back of the ticket stub to show what else is coming up.
At the Outside Lands Music fest in San Fran, they gave away these 15 free itune cards – for bands that were at the festival!
How smart is that?
Because any proper music fan would know that music festivals are mostly a way to come across some new bands. So this is a nice taster, which later helps in making those casual goers into fans! Nice one itunes.