DrBobber

I am also having the same syptoms. It started occuring when I upgraded to WordPress 3.6

This is the error I am getting when trying to edit, add, change or view any event:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; compat/4.2.08050; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; 98770040903; Engine/6.08050)
Timestamp: Sun, 4 Aug 2013 16:57:43 UTC

Message: Not implemented

Line: 16
Char: 133
Code: 0
URI: https://www.southlaketroop937.org/wp-content/plugins/ajax-event-calendar/js/jquery.simplemodal.1.4.3.min.js?ver=1.4.3

It sounds like you are using WordPress to manage a Boy Scout website just like I am.
I use the Contact Form 7 plugin to manage exactly what you are doing. You have to manually enter the Scout-Leader emails into the form (separate them by commas, not a semi-colon like in Outlook). I created a form for contacting the Scout-Master, all the Assistant Scout-Masters, and the Troop-Committee. Now the scouts can just go to the website and send a request for Scoutmaster Conferences or BOR’s without it going to everybody in the Troop email distribution list.