Hi, jodahministries. Great question!
This is the first I’ve heard of this behavior with the type of fairly basic HTML that you’re using (http://www.jodahministries.org/events/). Is there anything that you know of that triggers the disappearance?
Is it possible that this is a result of a conflict with your theme or one of your plugins? Have you had the opportunity to follow our normal troubleshooting steps of disabling all other plugins and reverting to one of the default WP themes like Twenty Twelve?