Indietracks is a wonderful little music festival in Derbyshire.
I went there for one day last year, and really enjoyed it, going again this year, and you should too!
It's the only festival I have ever been to that you can watch the bands walk of stage, and then sit/stand next to you to watch the next band.
The headliners are Camera Obscura, but it doesn't matter, you will see so many different types of bands.
Gigs on a train I shit you not! A band even handed out cake in the middle of a set at one point.