In order to add an image for the Page Title Background in the Events listing pages, like this one:, please follow the steps below:

The listing pages are automatically generated from the Event Calendar plugin and they don't have local Vamtam options like the standard ones. They use the default theme's options.

Step 1:

Please go to the global VamTam option panel in Dashboard > Vamtam > Styles > Header > Page Title Background

Step 2: 

Click the "Save changes" button