Regarding the 2018 ICM:
Simon Donaldson presented the opening plenary lecture –
Some recent developments in Kähler geometry and exceptional holonomy. Written version:
https://arxiv.org/abs/1808.03995
Song Sun gave a sectional lecture in Geometry –
Degenerations and moduli spaces in Kähler geometry. Written version: https://math.berkeley.edu/~sosun/ICM.pdf