Hi,
Sorry for the issues you are having. Do you have a license for Pro and can you sign into and post in our Customer Forums. This is for Pre Sales Questions Only.
If you are having issue issues with the free version of the Events Calendar please post on the WordPress.org Forum:
https://wordpress.org/support/plugin/the-events-calendar
As for the way the calendar is setup it separates Upcoming and Past events and they do not show on the same page.
That could be possible, but not without a customization, which is beyond the support we can provide.
Thanks