Hi I would suggest a do-a-thon for
PowerModels.jl, PowerModelsACDC.jl to solve various optimal power flow problems for AC and DC grids considering different power flow relaxations.
As PowerModels.jl is very friendly in extending the classical OPF problem as well formulations there is a lot of potential. We have written various packages extending PowerModels, e.g. security constrained optimal power flow, transmission extension of HVDC networks, on the basis of which I could show how to extend PowerModels.jl
I am looking forward to your ideas / suggestions.