Slash (Guns N’ Roses) has revealed the details for his “S.E.R.P.E.N.T. Festival” tour. The trek will take place this summer and it will find the guitarist joined by the Warren Haynes Band, Keb’ Mo’, Larkin Poe, Christone “Kingfish” Ingram, Samantha Fish, ZZ Ward, Robert Randolph, Eric Gales, and Jackie Venson on select dates. This news…