Hey Ethan,
We unfortunately can’t help with customization questions like this one. 🙁 Check out the “Product Support” section of this page for more information → http://theeventscalendar.com/terms
While what I wrote above is true, I would like to share some resources that might help regardless. We have described some of the code changes required for this sort of customization in threads like this one → https://theeventscalendar.com/support/forums/topic/add-venue-to-month-tooltip/
I’d recommend searching our archives for threads related to this customization to find some helpful conversations → https://goo.gl/8lGIm9
This general guide that we have about making template customizations might also be helpful → https://theeventscalendar.com/knowledgebase/themers-guide/
I hope this helps!
Best of luck with your customizing,
George