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"For the low low price of $395, you too can have the wonder and joy of Event Handling. And if you act now, we'll even throw in extra features such as Advanced Analysis, XML, IrDA, and more remote communication VIs and tools that you can imagine."
NO, the event functions are not available in earlier versions of LabVIEW. But for the price of the upgrade, you can't even begin to start writing code to mimic event handling. There is code out there (otherwise, why would NI have created event handling...) to do this, but it is hard to come by, and extremely difficult and time consuming to do on your own.
In short: upgrade to LabVIEW 6.1.