sounds like a great idea!
I think the people mostly entertain themselves, just chatting and exchanging ideas is already very fun!
You should definitely plan for several hours though, and also provide some drinks if possible.
We had a Beamer which was great for presentations and demonstrating the cash-out process on Steemit. I think that would be helpful too. I think a mixture between presentations and socializing/chatting like we had was a good combination!