The difference between EST/EDT and CEST/CET is 6 hours, meaning for the central Europe (everything between Britain and Israel, if I'm correct) 6pm EST is midnight. Depending on how long this event could last I suggest moving the start time so the event would END at that time, not start. If, for example, the event would last 2,5h, as predicted, somewhere around 3/3:30 pm EDT would be optimal, IMO, similar to the SCS time, if I'm correct.