Unfortunately, our Calendar widget will always show the current month. The ability to select a default month is not currently supported in the widget. If this is something you’d like to see in a future release, I would suggest submitting it as an idea on our UserVoice page. Our team periodically reviews the most popular ideas for possible inclusion in a future release of the plugin.
With that being said, you could still select a filter on the Calendar Widget to only show events of a certain category. This would ensure that your Upcoming Events in September would always display correctly.
I hope that helps, but let me know if you have further questions. Thanks! 🙂
-Casey-