Cover for facebook and meetup group photo.

We need to make a cover that will be used for the FB social network of the Adiuvo project and also for the main photo of the meetup group.
The project is a community where we, Go and Rust language professionals, will conduct technical meetings and training in these languages. I would like all this to be reflected in the design.
I'm waiting for your ideas and suggestions.
https://www.meetup.com/vilnius-rust-go-meetup-group/
https://www.facebook.com/profile.php?id=61550337872052