Camden's Susquehanna Bank Center is celebrating two decades of hosting some of the spring/summer season's hottest concerts by giving away lawn seats for just $20, for a limited time.

The "20 for 20" promo is going on now through May 20th and fans can grab cheap tickets for – you guessed it – over 20 shows currently on sale at the venue. That means the Radio 104.5 Birthday Show, Tim McGraw, Backstreet Boys, Lionel Richie, both days of the XPoNential Music Festival and much more.

Check out the full list of eligible concerts below: (get tickets here)

- MMR*B*Q 2014 ft. Rob Zombie, Volbeat, Jason Bonham’s Led Zeppelin Experience, Dropkick Murphys, Fuel & more
- Radio 104.5 Birthday Show ft. Foster The People, Third Eye Blind, Cage the Elephant, Bastille & more
- Brad Paisley with Randy Houser, Leah Turner, Charlie Worsham and Dee Jay Silver
- Ray LaMontagne with Jason Isbell and The Belle Brigade
- Tim McGraw with Kip Moore and Cassadee Pope
- Zac Brown Band
- Backstreet Boys with Avril Lavigne
- Journey & Steve Miller Band with Tower of Power
- Fall Out Boy & Paramore: Monumentour
- Mix 106 Presents Summer Jam 2014 ft. OneRepublic with The Script
- WMGK Let Freedom Rock Fest: Foreigner, Styx, Don Felder
- Lynyrd Skynyrd / Bad Company with Steve Rodger and The Dead Daisies
- James Taylor
- Lionel Richie – All The Hits All Night Long Tour with CeeLo Green
- Under the Influence of Music Tour: Wiz Khalifa, Young Jeezy, Tyga, Ty Dolla $ign, & more
- XPoNential Music Festival ft. Beck, Band of Horses and The Districts
- XPoNential Music Festival ft. Ryan Adams, Jenny Lewis and Dawes
- Rockstar Energy Mayhem Festival ft. Avenged Sevenfold, KORN & more
- Mushroomhead, Texas Hippie Coalition, Upon a Burning Body, Veil of Maya and Darkest Hour
- Def Leppard & Kiss
- Linkin Park with Thirty Seconds To Mars and A.F.I.
- Goo Goo Dolls and Daughtry with Plain White T’s
- Motley Crue – The Final Tour with Alice Cooper