Only been to one of these in Pattaya in over 1000 concerts here, never again, one of the worst. Insane security who took umbrellas and pens off people and also cut water bottles open, barriers in front of the stage and horrible atmosphere.
I would suggest it's normal practice to decide on venues and those appearing, and when well before announcing it.
'Details about the lineup and location are still limited, but it is sure to be a hit with music fans'