User blog comment:Jethro Harper/Good Morning, or Evening (Depending on where you are =D)/@comment-29383865-20160809112332/@comment-23.17.174.55-20160812021832

They skip the event in Railgun Manga but at the end of Season 2 of railgun it was implied that SS Liberal Arts City was coming next if there was a Season 3. It would be between the Events of Sister Arc and the Railgun verson of the Daihaseisai Arc but it did not show up in the Railgun manga.