20) has had 1 concert.

20) is most often considered to be Pop Rock, Post-Grunge, Neo Mellow, and New Age.

The last 20) concert was on April 20, 2017 at Spirit of Suwannee Music Park in Live Oak, Florida, United States. The bands that performed were: Widespread Panic / Bob Weir and the Campfire Band (2 days) / Trey Anastasio Band / Gov't Mule / Dark Star Orchestra (2 Sets on 4 / 20) / Dr. John & The Nite Trippers / JJ Grey & Mofro / Les Brers / Jaimoe’s Jasssz Band / Leftover Salmon Performing The Music Of Neil Young / The Greyboy Allstars / Blackberry Smoke / Matisyahu / Keller Williams’ Grateful Grass / Papadosio / Turkuaz / Pink Talking Fish / Bobby Lee Rodgers Trio / Devon Allman Band / The Marcus King Band / The Yeti Trio.