In order to change the Upcoming events' background image on Home page and in single event view, see the instructions below:
1. To change the Upcoming events' background on Home page
You need to edit the column's background image:
Please read also this guide: https://support.vamtam.com/support/solutions/articles/207348-guide-to-vamtam-drag-and-drop-builder-visual-composer
2. To change the Upcoming events' background in single event view, please go to VamTam >> General Settings >> Single Event (Tribe) >> Footer Background