Depending on the place you're using you'll may have to share the bar with the bartender from the place you've rented; here you can find a template to calculate it. (You'll may have to do it during the party)
Prepare the visuals (flyers) according to the OuiShare Fest theme
Don't forget to prepare the description (place, artists, hours...) of the event to put it on facebook, the digitick event and on the OuiShare Fest website
Make a guest list, if needed, to let at the entrance (name + surname)
Plan the moment for the artist balances (the d-day, on the morning if the space is free)