A long-standing feature request was just released today! Now you can set your event details to open in a new window.
To do this, you use the detailBase property in your spud code with a new property called openInNewWindow.
Here's a topic that talks about the detailBase property, which links you to an example of a spud that uses it.
Here's an example of a spud that opens the details in a new window:
This particular example opens the details on the calendar's Trumba hosted page. For your spuds, use the URL of the page that holds your main calendar spud (similar to how you use the teaserBase property).
Let me know if I missed or can clarify anything.
Jill / Trumba UA