I played a bit with the colors and structure and here is where I landed.
I know what you will say: The DIF purple does not mix well with all OSCEdays colors. But I find the combination of the purple and the OSCEdays colors to have a certain edgy happiness that I find pretty appealing - and appropriate!
Look at it for a while (I did) it's fun.
(2) larger circles
Ideas for SMALLER LOGO LIKE PIC
Ah, I switched places between OSCEdays and DIF Logo to show that DIF is in lead here.
More appealing than dark blue or dark grey. I think happiness and fun should be key. And maybe even edginess. That's how we add value to DIF and make a difference, maybe.
I am out for tomorrow. Will be back on Monday and look at your iterations.