I don't think so. At some point in the past, I wrote an application to trawl through the Event Log to pick out individual logon/logoff events, and feed them to another (billing) process.

Unfortunately, it's been so long (like 5 years or something), I can't remember how it worked any more. And part of the contract was that we had to hand over all the source code, so I can't peek.

Maybe you can find/write something similar.