Layout modifications with Divi and TheEventsCalendar


I stuck with a website project that needs to be completed asap. In a few words; mainly the integration of theEventsCalendar in Divi need some improvements. We would like to see the Events of one year as Tiles (4×۳ Grid…). We did experiment with a number of plugins, but we are not satisfied yet and running out of time.
Altough this is more a hobby-project, we want it to be finished soon.
The Event-“Grid” should show the Events (only one or two per month/tile, there are not more to show ;-)) and a klick on the event should open a PopUp with Event Headline, Content and a costumized RSVP for this event).
There is some stuff already installed: TheEventsCalendar, DIVI Theme, The Events Calendar Shortcodes Pro, Content Views Pro

Can someone help?