there are 5 images set using backstretch (as per the JS in the HTML);
var BackStretchImg = {"src":"https:\/\/aboveallevents.com\/wp-content\/themes\/limo1\/images\/hero.jpg"};
var BackStretchLeftImg = {"src":"https:\/\/aboveallevents.com\/wp-content\/uploads\/2016\/10\/unspecified-e1476891431865.jpg"};
var BackStretchCtrLeftImg = {"src":"https:\/\/aboveallevents.com\/wp-content\/uploads\/2016\/10\/Fotolia_104797475_Subscription_Yearly_M_PLUS-e1476891656606.jpg"};
var BackStretchCtrRightImg = {"src":"https:\/\/aboveallevents.com\/wp-content\/uploads\/2016\/10\/Fotolia_89255602_Subscription_Yearly_XL_PLUS-e1476891856604.jpg"};
var BackStretchRightImg = {"src":"https:\/\/aboveallevents.com\/wp-content\/uploads\/2016\/10\/unspecified1-e1476891970861.jpg"};
so that indeed is the hero image and the 4 ones underneath it.
let’s go for the other approach; can you:
1. remove the backstretch stuff from AO’s JS exclusion list
2. replace your critical CSS with the one here?
3. make sure to flush all cache (autoptimize, keycdn, …)
maybe that fixes things …
frank