I am a big fan of the Music Festivals, though the ones I go to are more the hippie / Jam Band fests rather than Lolapalooza or Bonnaroo.
This year, I went to Summercamp in Chillicothe Illinois - the lineup included Moe, Flaming Lips, Umphrey's McGee, George Clinton, Avett Brothers, Clutch, Madahoochi, Hot Buttered Rum, Cornmeal... and many, many more.
I'll also be going to Wakarusa which starts tomorrow, Lawrence Kansas.
Lineup can be found here, I'm really excited to see Zappa Plays Zappa again, and Cake for the first time.
July 4th I am likely going to Rothbury, in Michigan, which has about the most awesom lineup I've ever seen, as it includes several of the "Jam Band" favorites - Trey Anastasio, Phil Lesh, Primus, STS9, Keller Williams, Yonder Mountain String Band - plus some mainstream artists like Modest Mouse, Snoop Dogg, DMB, 311, etc.
I am also a big fan of some of the local midwest festivals, from the Schwagstocks to Bela Sol and Black Diamond Music Festival and the events at Bearcats Amphitheatre in Lesterville, MO.