You are using a plugin 'all in one event calendar' that injects requireJS.js before jQuery. Please help this plugin find jQuery.
To simply put it, jQuery and requireJS need to be integrated with each other in order to coexist peacefully. You can examine the lively discussion here http://stackoverflow.com/questions/4535926/requirejs-and-jquery?rq=1 you will get the idea, as well as the best way to get the two to coexist with each other.
From the creator: https://github.com/jrburke/require-jquery
Please try to remove the plugin , clear the cache, and see if there is flickering please.
 I don't own an iPad and asked my friend to take a look at the site, and there is no flickering I am told, but he was unable to click on the images to open a lightbox. Is this something you are also experiencing?