Transparent image background not displaying as transparent on events page

Hi all, 

Can anyone tell me how to remove what I'm assuming is an image overlay on images uploaded to the events page? I've combed through the site styles > colors and set every single Image overlayto transparent and I still can't get rid of it. 

any suggestions?  

Url is: https://onion-mouse-9rsa.squarespace.com/config/pages/6439cab11afc081849a4be02
password: awaken

Thank you!