  We detail the statistical distribution of bubble rearrangements in a sheared
two-dimensional foam. Such rearrangements, known as T1 events, are vital to
mechanisms resulting in flow through microscopic mechanical yielding. We find
that at a constant rate of shear, the rate of occurrence of T1 events shows
only small fluctuations. This rate is however seen to vary significantly with a
variation in the initial configuration of bubbles constituting the foam. In
addition, we detail the spatial and orientational distribution of T1 events and
relate them to the distribution of stresses in the bulk of the material. Some
insights into the irreversibility of the dynamics are also discussed.
