[iCal file only shows next two months]

The iCal file for our calendar only shows events during the next two months. For example, right now the file only includes events in April and May; no June events are shown. Is there a way to get the iCal file to show all future events?

[Trumba WordPress Plugin]

I was just wondering if anyone has written a WordPress plugin to incorporate a Trumba spud into a widgetized sidebar? 

Currently I am using a WordPress plugin called ICS Calendar which reads the iCal file from Trumba and incorporates it into my WordPress site, but I'm interested in using the spuds on my site.