According to this article: In January, Stan Grof may have got back together with his old cohort and head of Stargate, Russell Targ in a 2012 conference in Cancun. Says he was sick, though and maybe unable to attend...
However there is a boring article on how 2012 as the end of the world means they are hoping to be successful in altering everyone's minds. Stan Grof isn't mentioned here but such like as Pinchbeck are. And Grof is a paragraph or two above as I described on the link I pasted this from, http://www.greatmystery.org/nl/cancun2012grof-1.html

BRINGING TOGETHER Jose Arguelles, Jacque Fresco and Roxanne Meadows of the Venus Project, Graham Hancock, John Major Jenkins, John Kimmey, Mario Gómez Mayorga , Christine Page, Daniel Pinchbeck, Rocío López Ruíz , Russell Targ, and Miguel Angel Vergara, this gathering promises to be the groundbreaking event leading up to the 2012 planetary cyclical change.