"You can't go outside yet, it's not time. If the flag isn't done, we're totally not ready for our creation to be exposed to the world." Things like this had to be kept under wraps until they were complete. Unveiling them too soon did not give the complete effect. It wouldn't be fair to her creation, or the people that happen to wander by, for it to be revealed before its time.
"Besides. We can't go outside until we have everything we need. A good burning needs music and drinks. We don't have either of those yet."
Luckily, she had her ipod on her. That would be their source of music. She wasn't sure about the drinks. Really, when this whole thing started, she hadn't planned that far ahead. The what to do with it after scenario had never been part of the story. Her story ended with the victory and triumph she was going to achieve upon completion.