This may or may not be what you are looking for but, the Feed Manager feature can be configured to show a Calendar with feed events (see the settings for Feed Manager), and Event Calendar Pro can expose an RSS feed. So you could have a Feed Manager configured to consume the feeds from multiple instances of Event Calendar Pro and also configured to render as a Calendar. Then clicking the vents in the Feed Calendar should go to the event detail no.
You could try it on the demo site by setting up events in several instances of Event Calendar Pro and then setup a Feed Manager and try it out to see if its anywhere close to what you are trying to accomplish.
Best,
Joe