Help please?

So the wiki party will be one right? this may help em since I'm still getting over the death of casper, read depressing day for me... to understand more about casper. I do know that it will be 3:00 am and end at 7:00 pm for me since I live in aus, I can do it in the week end in aus but can someone translate the day, all I know is that in America it will be night, in day in aus so...? can anyone translate aus weekends, to American week ends thanks!