We don't know the fellow that made this video but it looks like he spent some time on it.
It seems like over the years there have been many memorable moments where either family members, friends, or excited people in the crowd find their way up onto the stage. We were lucky enough to receive this video that was captured by a fan at the Nectar. In this video, Chris Hayward climbs out of the crowd and onto the stage. Gabriel lends him his tambourine. Nectar security sends him on his way.