The website is built to accept sponsorships up to 30 days after the event date. You can change this close date via the administrative back end.
How to get there:
Login to your Wizathon account.
Click on the "Setup/Tools" tab.
What to do:
Click on "General Settings".
Scroll down to the "Sponsor Settings" heading, and then to "Accept Sponsorships Until".
Enter the time and date when you would like to accept sponsorships to end.
Click on "Save General Settings"