Hey accessrose. Thanks for the note here; this is indeed an issue with the latest Events code when running on WordPress 3.6. We’ve got a fix awaiting deployment in our next release – and in the interim you should be able to fix it with this snippet in your functions.php (https://gist.github.com/jazbek/6169607) as a temporary workaround.
Hope that helps and thanks for your patience so far. Let me know if you need anything else here.
Andy’s comment is correct: whatever theme you’re using has a functions.php file, and that’s where you’d drop this. Let us know if you need anything else here.