Yes, readers can still log once their challenge has ended. That said, they must back-date the reading so that the dates align with challenge dates in order for that reading to count toward their badge milestones.
If you do not want readers to be able to continue logging on your site, you can turn off logging by following the instructions below:
- Login to the administrative side of your site.
- Go to Setup > Site Options > Site Settings.
- Turn off "Allow Logging" by unchecking the box. The setting will be off if no green check mark appears and the box is blank.
Please note that the ability to log reading via the mobile app is always available and cannot be turned on or off.