Saturday/Sunday would work best for those of us living in the United States. Fridays tend to be bad for us due to those of us who work or those who have school (or both).
Might I suggest possibly changing the times during certain weekly events to include the Aussies as well
. They seem to get the short end of the event deals all the time and we need to push some love their way once and awhile...just a little...not too much love though