I'm a fan of the typical noon on Thursday.. or morning on Thursday..
I wouldn't venture off into the other days because as everyone mentioned, they are a bit more intense. Friday morning everyone is coming in, trying to get the match schedule and get going.. Saturday many people in picking positions are busy with planning..
Plus, the webhug is our little 'kickoff' to the days.. so when you see those familiar faces on Friday & Saturday you can greet your fellow forum users.
I'd also vote against Thursday night also, because if teams are still sticking around by the time they are over, it's likely only because they have one of the last matches or many repairs in the pits... Thursday night we like to leave as early as we can to have a relaxing night to prep in (dinner, team meeting, and the ever important volleyball).
Just my thoughts..

See you there if it's during a plausible time! If not.. I'm around.. don't be afraid to stop by and see us if you need any assistance, advice, or just want to check us out
Let's have some fun.