Hi Graham,
Thanks for reaching out to us, I’ll help you out on this one…
Just tested it locally and the widget seems to be working with next year’s events, so no limit there I guess. Are you applying any filters on the widget that might be preventing this future event to show (amount of events, categories, tags)?
if you think it should display (not caught by the filters), Can you please follow the steps described in our Testing for conflicts guide? This way we can see if this is a problem in our plugin or a conflict with the theme or other installed plugins.
Best,
Nico