Sandia is planning to hold the 2nd PV Pefromance Modeling Workshop in April or May of 2013 in San Jose, CA (date is not yet determined).  Stay tuned for details as arrangements are finalized.  We are going to host this workshop as part of a Sandia PV Systems Symposium, which will include not only PV Performance Modeling Sessions, but also sessions on Inverter Reliability and PV System O&M.  We will send out an official announcement and agenda in the coming weeks.  We hope you will consider participating!