SEDE12 Deadline Extension for Papers
XSEDE12 will extend the deadline for paper submissions to May 2, provided an abstract is submitted by the April 25th deadline. A paper abstract must be submitted by April 25 to qualify for the May 2nd extension. All abstract-only submissions are still due April 25. No further extensions will be issued.

For details, including updates to the Key Dates for XSEDE12 submissions, please see:
https://www.xsede.org/web/xsede12/call-for-participation .