6 Days to Air: The Making of 'South Park' is a documentary by Arthur Bradford. Matt Stone and Trey Parker granted access for Bradford's camera crew to South Park Studios (to Anne Garefino's shock) to film the first 7 episodes of South Park's Fifteenth Season. The documentary mainly showed the making of "HUMANCENTiPAD".
The documentary premiered on Comedy Central at 10pm on October 9, 2011.
In the "HUMANCENTiPAD" segment, it shows the cast celebrating Easter, and a decorative "SOUTH PEEP" cake is seen, too.