After reading these replies, I suggest two days. One on the weekend, and one in the week. Like thursday, and/or saturdays both at 8pm. That way, you can choose which one fit better or be there both days. How about it?
Edit: If the server was "open" everyday at 8pm, it would be more casual, and possibly attract more people. However, the owner of the server might see this as a problem. Give a reply what you think. Also I dont know how it works, but it sounds to be a good idea, that on the http://migc.scummbar.com
site, there would be written "todays active game on the server". Like if it would be written "UT" there, people would know UT is open on the server today. Discuss, and/or explain to me why this would not work.