Howdy Andrew, and thanks for checking out the plugins!
Yes, it is possible to show both past and upcoming events together and the PRO version is not needed to do that. For example, you could create a new page template in your theme and then either set up a new WP_Query that fetches the “tribe-events” post type or using our tribe_get_events() function to create the query. Both methods will allow you to request events, regardless of whether they are past or upcoming.
In fact, here’ s a post with a ton of information and examples on how to use the tribe_get_events() function that I think would be a huge help here.
Cheers!
Geoff