Generalizations of chip-firing and the critical group July 8 to July 12, 2013 American Institute of Mathematics, Palo Alto, CA Organizers: Lionel Levine, Jeremy Martin, David Perkinson, and James Propp Description: This workshop, sponsored by AIM and the NSF, will center around the abelian sandpile model and related chip-firing games on graphs, including generalizations to higher dimension, abelian networks, and pattern formation. Deadline: March 8, 2013 Details: http://www.aimath.org/ARCC/workshops/chipfiring.html