How to get a GA ticket, tips and tricks

What is the best way to get 1 GA ticket when I don't have another GA ticket for different night to trade? Looking for Hollywood night 2
Hartford 10.25.13 | NYC - GCF 09.26.15 | MSG 05.02.16 | Fenway 08.05.16 | Fenway 08.07.16 | Seattle 08.08.18 | Seattle 08.10.18 | Missoula 08.13.18 | Chicago 08.18.18 | Chicago 08.20.18 | Fenway 09.02.18 | Fenway 09.04.18 | MSG 09.11.22
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Song Wishlist: Alone, Let Me Sleep, Brother, full W.M.A., Hold On, Bugs/all of Vitalogy, Mankind, Around The Bend (full band), The Long Road, Don't Gimme No Lip, Pilate, Push Me Pull Me, All Those Yesterdays, Rival, Parting Ways, Ghost, Bu$hleaguer, WWS, Parachutes, Army Reserve, low octave Driftin', Strangest Tribe, Other Side, Undone, Fatal, Hitchhiker, Education, Black Red Yellow, Of the Earth, Love Reign O'er Me, Gonna See My Friend, Santa Cruz, Infallible, Yellow Moon, Alright, Comes Then Goes, and the Mamasan Trilogy.