Did one of them involve guys in pig masks, and the other involve four or five blokes sat behind tables with things like tabletop guitars and loads of chains? If they did, then, as Thomas Moronic says, that was V/VM and Morphogenesis. The Morphogenesis set was released on a CD.
(Yes, the concert chronology confirms that:
http://www.sonicyouth.com/mustang/cc/070100.html.)