EDIT: For now I've changed "Expires:" to "Next Update:"
I've thought more about this concern and I understand the logic but I wonder if we are not using "expired" the way it was intended. John, your solution is to explain what "expires" means in this context. I have taken a similar approach. In the script, I changed "Expires:" to "This Statement Expires:" but that is just as misleading. I don't think that is the best solution. I think we need to change what data we put there to reflect the actual event end time. I feel as though the "expires" data in the API is there to define when that data becomes stale and to let the audience know that there should be something newer by that time, not to display an event end time.
Ken, I hope you'll revisit this at some point because as John pointed out, it causes confusion.