[past Witt vector conferences]
Witt Vectors, Deformations, and Absolute Geometry (University of Vermont, 2018)Arithmetic and Algebraic Differentiation (Berkeley, 2015)
Geometry of the Frobenius Automorphism (Luminy, 2014)
Witt Vectors Lifting and Descent Special Session, (JMM in San Diego, 2013)
Witt Vectors in Arithmetic, Geometry and Topology (Albuquerque, 2012)
Witt Vectors, Foliations and Absolute De Rham Cohomology (Nagoya, 2010)
Frobenius Lifts (Leiden, 2009)