Best Damage should be first event. For Best Damage Per Second we we need to fix low attack speed issue in some cases first. For some classes, there will be separate critical and cast challenge (Best DMG, for Best DPS can't confirm yet). The time to complete the event will be long and event repeated, there is no need to prepare character now. Rules for party buffs have yet to be established, they will probably be ruled out, as this is supposed to be a single player event.