The only issue is that Forgotten Honor is starting with a Saturday campaign in January. So if Saturday is the only preferred day, it would have to be organised with organisers who are not involved in the campaign.
I think a lot of people find Saturday to be a good night for an event as it means that people both sides of the pond can indulge at the same time, that said I think people are cool with Sunday night as well for the same reason, being the weekend keeps things flexible and allows as many people as possible to participate no matter what time zone they're in.
So in short Saturday perhaps slightly preferable to some, but Sunday good also.
Alright, January is approaching, so I think it's time that we think about a possible future event and start planning it ASAP! It worked out quite well last time and we all had a blast. Let's not make this a one time only happy memory.