I assume Massara Blue Jeans wasn't a performance (probably a sortof interval) as the audience are talking amongst themselves and not doing the "OI OI OI OI" etc...
During the talk there's a long tongue twister part where they keep repeating "HaroPro Yanen" with various variations on the pronunciation or something, not quite sure what they're doing. EDIT: Ah, I got it... "Aka HaroPro Yanen, Aoi HaroPro Yanen, Kiiro HaroPro Yanen......"