Here is a current wish list of topics for the background talks:
Anomalies
Anyon condensation
BPS states
Categories of topological defects
Cobordism hypothesis
Condensation
Defect theories
Drinfeld centers
Geometric engineering
Higher form symmetry
(Higher) fusion category
Logarithmic CFTs
SPTs & SETs
Symmetry TFT
TMF
(T)QFT
Verlinde formula
Emanant and subsystem symmetries
In case you have any suggestions for a potential topic or want to give a talk on one of the topics listed above please email iromaidi "at" ed "dot" ac "dot" uk