Sadly, nothing trivial.
IF you can find something that will save location coordinates of Calendar entries in any known file format, that could be turned into a TomTom POI and added to your unit that way.
Google gets its hands on almost nothing of my personal data, so I don't know what sort of export options Calendar has.
The newer Tomtom's may support this later this month when the MyDrive cloud service for Android is released. Until then, there isn't an easy way to do it, and the VIA1405 is too old for cloud compatibility.
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