Simple really, what concerts/shows have you been too? I know I'm going to be shamed here but here's mine:

2011: Katy Perry, The Californian Dreams Tour
2012: Madonna, The MDNA Tour
2013: Beyonce, The Mrs Carter Show World Tour
2014: Katy Perry, The Prismatic World Tour
2014: Ed Sheeran, X Tour - Upcoming
2014 (possibly): Lily Allen, Sheezus Tour - Upcoming

Total: 5, possibly 6

and I'm possibly seeing Lily Allen in November. Best one so far is between Madonna's MDNA Tour and TMCSWT, can't decide!

I have this unrealistic goal of seeing 100 concerts, and so far I'm at 5. Don't think I'll make it

I've seen Matchbox 20, Alanis Morissette, Flyleaf, and my favorite La Roux.

Going to see Juicy J later this month and will definitely see Florence when she tours her new album.

Alanis?! I love you.

7/8/2014 — Paramore + Fall Out Boy
7/1/2014 — KITTEN + ♡kitty♡
6/28/2014 — Tegan and Sara
11/21/2013 — Paramore
7/19/2013 — Warped Tour
6/7/2013 — Ke$ha
5/10/2013 — Paramore and KITTEN
3/12/2013 — Circa Survive and Now, Now (I was pulled on stage!)
1/26/2013 — Brother Apollo
1/12/2013 — La Dispute, Into It. Over It., The Swellers, and Pentimento
11/10/2012 — The Swellers
11/2/2012 — Falling In Reverse w/ Enter Shikari
8/3/2012 — The Swellers (10th Anniversary)
7/22/2012 — Rockstar Mayhem Fest
7/6/2012 — Warped Tour
4/15/2012 — LIGHTS
2/25/2012 — D.R.U.G.S
10/23/2011 — The Swellers (Fall AP Tour)
7/20/2011 — Warped Tour
6/18/2011 — The Swellers (CD Release Show)
4/9/2011 — VersaEmerge (with Black Veil Brides, D.R.U.G.S, I See Stars and Conditions)
8/15/2010 — Paramore and Tegan and Sara
5/4/2010 — Paramore
7/17/2005 — Avril Lavigne

Total: 24

I also have Charli XCX, The Pretty Reckless and LIGHTS coming up!

17/09/2011: Avril Lavigne - The Black Star Tour
20/07/2013: Rihanna - The Diamond World Tour

Shania Twain: Come on Over Tour
Alice Cooper: Theatre of Death Tour
Carrie Underwood: Blown Away Tour
Zac Brown Band: Uncaged Tour
Katy Perry: PRISMATIC Tour
Tim McGraw: Sundown Heaven Town Tour

Panic! At The Disco
Motion City Soundtrack
Def Leppard
Van Halen
311
Stone Temple Pilots
Dierks Bentley
Bush
Luke Bryan
Chase Rice
Switchfoot
Dierks Bentley
Chase Rice (November 1)
Luke Bryan (October 24)

The ones bolded were part of a festival line up

2007 (?) - Aly & AJ + Jonas Brothers
June 2013 - Marina and the Diamonds
December 13th, 2013 - Beyoncé
July 11th, 2014 - Lady Gaga

Upcoming -
Lily Allen
LIGHTS

Beyonce: The Beyonce Experience, I Am...Tour, Mrs. Carter Show

Lady Gaga: The Monster Ball, ArtRAVE (soon)

Miley Cyrus: Bangerz tour

I saw Justin Timberlake and Jessie J on a festival.

Hilary Duff: Still Most Wanted Tour, 05/16/06
Hilary Duff: Dignity Tour 01/12/08
Black Eyed Peas: The E.N.D. World Tour, 09/30/10
Katy Perry: California Dreams Tour, 09/05/11
Pa'l Norte: Rock Festival, 11/09/13
Miley Cyrus: Bangerz Tour, 03/16/14
Lana Del Rey: ??? Tour, 10/08/14 - SOON

I think that's it..
I was gonna go to see the Jonas back in 2010 or 2011 I don't recall what year but they moved the date to July because of the H1N1 stuff and I didn't get to see them because I was going to be on vacation with my family and I had 1st row ticket I got so depressed, literally

2013- Pitbull/Kesha
2013-iHeartRadio's Jingle Ballat Madison Square Garden(Pitbull,Enrique Iglesias,Macklemore &Ryan Lewis,Ariana Grande,Selena Gomez,Jason Derulo,Austin Mahone,Fall Out Boy,Fifth Harmony,Paramore and Miley Cyrus)

Rihanna: Diamonds World Tour and twice at the LOUD Tour (Atlanta, Greensboro & Dallas with the fire fiasco )
Kesha: Get Sleazy Tour (St. Louis)
Keri Hilson - Outside of a Walmart here in Memphis if you count that as a show

September 22, 2012 : Lady Gaga - Born This Way Ball.
June 20, 2014: One Direction - Where We Are Tour.

Upcoming
October 31, 2014: Lady Gaga - ArtRAVE: The Artpop Ball.
November 2, 2014: Lady Gaga - ArtRAVE: The Artpop Ball.

(+ February 26, 2015 : Katy Perry - The Prismatic World Tour. Not sure yet).

10/2/2003: Shania Twain - Up! Tour
10/5/2009: Marianas Trench - Beside You Tour w/ Carly Rae Jepsen ()
6/30/2011: Katy Perry - California Dreams Tour
7/19/2014: Katy Perry - The Prismatic World Tour

I've also been to a few festivals

Lana del Rey 2x
Iggy
MGMT

and I've been to a couple festivals.

I saw Both Bey & Rih last year.
I saw B5 when I was like 8

2nd June 2013 - Lana Del Rey - The Paradise Tour
2nd July 2013 - Rihanna - Diamons World Tour
7th July 2013 - Rihanna - Diamonds World Tour
10th June 2014 - Miley Cyrus - Bangerz Tour
13th June 2014 - Lily Allen - Orange Warsaw Festival (Sheezus Tour?)

+ I'm gonna see Gaga this October and Katy next February!

Lorde
Bruno