To put on a 1-day event, I need a venue. Space to have 8 or less people work on products that were chosen. Ideally get the space for free/barter.
I aim to test this as inexpensively as possible. A little for supplies and food, but not much else. I have a co-working space near me that I'm going to see if I can get some time/space donated (I actually designed and fabricated their sign). Another option would be a house. I don't have one and would need to find someone willing to host.
So a little space and good wifi is all I really need to test this. Finding a handful of people I know that would be interested too.