aspx, xsl, xml issue when argument can't be resolved

I have a page called [login to view URL] that is populated by an xml document. It shows up to 3 of the upcoming events as long as the date is valid and not expired (there currently are 5 events in the xml doc). Project task: I run into issues when less than 3 upcoming events are valid. This naturally occurs because time passes and events are no longer valid. The page cannot resolve and crashes my server. I am looking for someone to correct the problem. Ideally I would like my page to show one of two scenarios. 1) show only 3 events if there are more than 3 valid upcoming events, OR 2) show the actual number of valid upcoming events if less than 3 events are valid (example: if only 2 valid events, allow the code to resolve, disregard the 3 events setting, and show the 2 upcoming events). I am not a coder, so the solution requires basic notation in code describing how the the problem is being resolved. All files are attached in zip file. Thank you in advance for your consideration of my project.