Hi,
Thanks for using our plugins. I can try to point you in the right direction on this.
We do not have a feature to display two months at once or any coding to provide on this.
Unfortunately, we do not have any shortcodes for the Month view or any of the other main views (map,photo, etc).
So it could be possible with a customization, but that is beyond the support we can provide.
However, to get started you can look at our themer’s guide:
https://theeventscalendar.com/knowledgebase/themers-guide/
That will show you how you can move the month view template to your theme to safely edit there.
Let me know if you have any follow up questions.
Thanks