Just FYI, and I had/have no issue with this so no one worry about it, but last year I really wasn't able to get solid answers out of many people on where, when, and how many people were going to show up... so I just picked a place and time that seemed like it had the best chances based on what I did know... and we did have several people show.
Trying to pick a time out that works for everyone is, imo, impossible DURING the Con, which is why I just went with Sunday after the merchant hall closed. Although I think next time around I'd make it a cheaper place.
So... in the end, if you're a week out and no one has given solid answers, just pick a time and place, let everyone know and leave the rest to the dice.