Back in 2009, Charlie Miller circulated a lone Midnight Hour "from an unknown show": <http://archive.org/details/gd1968-00-00.sbd.miller.97671.flac16>
He wrote: "This Midnight Hour was on the end of Rob Eaton's 2/14/70 Dat, which he got from Dick Latvala. It was labeled as the encore. Obviously, it's not from 2/14/70. You can tell by the mix that it is from 1968." Actually, this Midnight Hour is the encore from the Family Dog, 9/6/69. David Lemieux has included this a couple times on the dead.net Taper's Section. <http://www.dead.net/features/tapers-section/august-29-september-4-2011> Only the first 45 minutes of the show have circulated. The Vault just has the last two songs, Casey Jones & Midnight Hour. Jefferson Airplane played after the Dead - in fact, on the Taper's Section clip you can hear Garcia saying after MH, "Jefferson Airplane, coming up next."