I didn't think anyone would remember the Loading Zone. They made the bill with the Who at the Fillmore in '67, but they did not blow away the Who. The real ear opener was some unknown group not even on the bill - Santana! I saw the poster for sale a couple of years back and I wanted it for what was not on it, but at this point, collectible and expensive.
'they blew'em off the stage'
what concerts have you attended, where the warm up act blew the headliners away.....my examples...brownville station upstaging zz top to the point where people where chanting 'brownsville station!' during the littl ol' band from texas' set.....another..t.rex upstaging lynyrd skynyrd(yes there really was such a show), and the grass roots upstaging cream.