Hey @creativecollab,
There’s unfortunately no easy way to do this at this time 🙁
The order is dictated by code deep within the core of the plugin, and so it’s unfortunately pretty complicated to modify at all. And since it’s core plugin code, it would be overwritten any time you updated the plugin.
—
Despite what I wrote above, if you’re REALLY interested in changing this regardless, then you would have to head to your plugin files for The Events Calendar. Then navigate to /src/Tribe/Month.php
Once in this file, look for the method get_daily_events() – I highlighted the code in a Gist for you here → https://goo.gl/2W2Jgb
To alter the order, you would modify the 'orderby' parameter. You can learn all the acceptable options for that parameter here → https://codex.wordpress.org/Class_Reference/WP_Query#Order_.26_Orderby_Parameters
I’m sorry that this isn’t easier to change at this time – but I hope this information helps!
Cheers,
George