Groupoids and Stacks in Physics and Geometry
Posted by John Baez
From January 8th to April 6th of 2007, the Institut Henri Poincaré will be running a program on:
This will include a workshop on Higher Structures in Geometry and Physics from January 15th to 19th, in honor of Murray Gerstenhaber’s 80th and Jim Stasheff’s 70th birthdays.
If you don’t know about groupoids and stacks, or even if you do, try this overview of the subject.
The program on Groupoids and Stacks in Physics and Geometry will feature the following workshops:
 Higher structures in geometry and physics
(Jan 15Jan 19)
Organizers: Alberto Cattaneo and Ping Xu 
Quantum cohomology of stacks and string theory
(Feb 12Feb 16)
Organizers: Kai Behrend, Barbara Fantechi and Andrew Kresch 
Groupoids in operator algebras and noncommutative geometry
(Feb 26Mar 2)
Organizers: Jean Renault and JeanLouis Tu
There will also be a number of long courses, including:
 Kai Behrend and Andrew Kresch, Introduction to stacks
 Lawrence Breen, Categorical Structures and cohomology
 JeanLouis Tu, Operator Algebras, Ktheory and groupoids (abstract)(résumé)

Ping Xu, Lie groupoids and Poisson geometry
(abstract)
Some support is available for grad students to attend  see the program website.
Re: Groupoids and Stacks in Physics and Geometry
I was invited to teach a long course, but I can’t make it.
So, I hope nCategory Café customers who attend give us a report on what happens! We can start a blog entry about this program, where people can post their accounts of what happened. When the time comes, just email me a reminder.