This appears to be the earliest newspaper notice:

Boston Evening Transcript (Sept. 21) p. 2:

“GILMORE’S POPULAR CONCERTS. After an interval of rest and preparation for a new campaign, the indefatigable Gilmore enters the field of amusement with a new and attractive programme. He promises to give three concerts at Tremont Temple – on the afternoon and evening of next Saturday, and the evening of next Sunday – which will introduce musical talent of a very high order of merit. Mademoiselle Camilla Urso, the lady violinist, who is one of the artistic wonders of the world; a full orchestra; a complete military band; the services of Mr. Fr. Rudolphsen, the distinguished baritone singer; [etc.]…. The music to be performed is equally divided in character….Selections from oratories, operas, Stigelli’s ‘Lear,’ the Laura Polka, Nightingale Waltzes, and the ‘Soldier’s Return March,’ introducing a new and popular army song, ‘When Johnny came [sic] marching home,’ (published just now by Tolman) will be given. The price of tickets has been fixed at the low sum of twenty-five cents.”