There will likely be an extension because krysyy wasn't able to get online and make announcements due to real life craziness.
I don't think something official will be organised, but I do encourage everyone to put up the res number or world download of their entry after the contest is over, so we can check them out!
I don't see the mistake that you are referencing. I must've been tired. That was a bad, bad, bad thing that I never would've done in my right mind.
Deadline extended to June 15th at 11:59 pm EMC time to allot for time I was unavailable to boost this contest in-game and on forums. -Added in-game announcement to remind everyone. -Also added official donation form so if you want to donate, do it through that.
You can just submit your build again. The most recent application will be used for the official contest entry.
Well, it does state in the instructions of the challenge that it must be maximum 60x60 (or the boudaries of a regular SMP residence).
How did you waste it? Did you only make it to win? You still practised your building skills through it, and you created something cool!
There are many ways. If you have a Google account, it's perhaps the easiest to upload the world map to Google Drive (to find the files (on Windows), do %appdata% at the start menu, and navigate to .minecraft/saves). You can then make the folder visible for anyone with the link by sharing it and clicking more options, and you can then send the link to anyone that needs to see the world.