Wanna know how I know this week was huge when it came to festivals news? Because we can now say the Red Hot Chili Peppers won’t be at Bonnaroo (but they will be at Summer Sonic), Portishead will return to curate ATP’s I’ll Be Your Mirror UK, the Foo Fighters are confirmed to headline Sasquatch!, and the Chemical Brothers have been tapped to play Ultra Music Festival. Plus, many more heavyweights are confirmed to headline Europe’s many music extravaganzas, and the Bonnaroo and Coachella lineup rumors keep coming in. And all that’s without mentioning all the festivals which announced their 2011 dates — Nateva, Voodoo, Hangout, Mountain Jam, Wakarusa, Gathering of the Vibes, and Telluride Bluegrass included.

Enjoy all the latest news and rumors below. Also, don’t forget to bookmark Festival Outlook and/or follow us on Twitter. That way you won’t have to wait until Wednesday before getting your festival fix.

News:

– Foo Fighters will headline the newly expanded Sasquatch! Music Festival.

– Lollapalooza has expanded into Chile. Perry Farrell is bringing his massive music festival to a new continent, with the lineup to be announced in December.

– Ultra Music Festival and Winter Music Conference are in a bit of an argument when it comes to booking dates and artists, though that hasn’t stopped the former from booking The Chemical Brothers as their headliner.

– The Red Hot Chili Peppers’ Chad Smith debunked rumors of an appearance at Bonnaroo 2011, but did confirm the band’s appearance at Japan’s Summer Sonic festival.

– Portishead will make their return at ATP’s I’ll Be Your Mirror.

– We exclusively revealed the 2011 dates for the Nateva Music & Camping Festival 2011.

Lineup Additions:

– Sasquatch: Foo Fighters confirmed as first headliner; 2011 dates announced

– Bonnaroo: Florence and the Machine (Rumored)

– Coachella: Robyn (Expected)

– Ultra Music Festival: Chemical Brothers and Green Velvet (Expected)

– South By Southwest: Added Alberta Cross, City and Colour, Devotchka, J. Mascis, Jeff the Brotherhood, Morning Teleportation, Noah and the Whale, and Prince Rama, amongst others

– Lollapalooza Chile: 2011 dates announced

– Voodoo Experience: 2011 dates announced

– Rock Am Ring (Germany): Coldplay confirmed as second headliner

– Summer Sonic Festival (Japan): Red Hot Chili Peppers confirmed as first headliner

– Benicàssim Festival (Spain): The Strokes, Arctic Monkeys, and Primal Screen confirmed as headliners.

– ATP I’ll Be Your Mirror (UK): Official lineup announced, including Portishead, Swans, DOOM, Beach House, Liars, and The Books

– Isle of Wight (UK): Kasabian confirmed as third headliner

– Download Festival (UK): Foo Fighters, Ozzy Osbourne (Rumored)

– Glastonbury (UK): Rush (Rumored)

– Reading and Leeds (UK): The Strokes (Rumored)

– BLOC Weekend (UK): Official lineup announced, including Aphex Twin, Beardyman, LFO

– Rock Werchter (Belgium): Added Chemical Brothers

– Big Day Out (Australia): Added Matt and Kim, Sia, The Greenhornes, and The Vines

– Soundwave Festival (Australia): Added Murderdolls, Polar Bear Club

– Noise Pop: 2011 dates announced

– Nateva Festival: 2011 dates announced

– Gathering of the Vibes: 2011 dates announced

– Hangout Festival: 2011 dates announced

– The Big Chill (UK): 2011 dates announced.

– Lattitude Festival (UK): 2011 dates announced

– Telluride Bluegrass Festival: 2011 dates announced