Just like baking a cake a summit requires many ingredients, bowls, spatulas, whisks, etc. If you are missing a whisk or a blender and have to mix the batter with a fork it will take you longer, right? If you have everything you need that will make it go a lot faster.
Think of this as the cake pan. It will hold it all together, but without it you'll be running to the store... if it's not already closed.
If you have everything you need in terms of resources, videos, banner images, speakers headshots, bios, email copy (and a high speed internet connection) then yes, I do believe you can.
If you follow my simple process you can have a summit up and running in 1 day, but either way you will have your summit done in record time.