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Results from off-campus programs are coming out and I've gotten a couple of callbacks that I want to schedule in the same week. However, I haven't heard from some firms yet.

I know that at least two of those firms have released callback invitations already. Should I count them as dings and go ahead and arrange my current callbacks?
Even if I do go ahead and schedule my callback trip, should I have any hope of hearing back from the firms that I haven't heard from yet (I actually interviewed around 4 days ago, but I wanted to know whether the firms release results all at once or not)

Thanks in advance!

In most, if not all, cases good news travels fast and no news is bad news.