Events + & too many redirects check out issue

We're getting a "too many redirects which is redirecting to another page, etc..." error. The page in question is located below. We've encountered this issue before, but don't recall the fix for it. Below is the page in question. Also, I have release dashboard control for you to look through the issue.

Thank you in advance,

http://onevoiceqc.com/store/cart/