Dallas is so overrun with festivals that it can be a little overwhelming. Picking and choosing is a necessity lest one suffer from a bout of festival fatigue. No matter how selective your list of must-attends is, though, Index Festival should be on it. The festival, which takes over Deep Ellum for the third consecutive fall this year, has grown to a three-day, 90-plus-band extravaganza that highlights the best of Dallas' best music neighborhood. Catch the big-name acts on the outdoor stages early, then stick around for the venue-hopping late-night fun that comes after. You never know what you'll find, but it won't be disappointing.